Top contract packagers in California, ranked by ChatGPT answers

Places ChatGPT showed

• Minimus Products · 5.0★ · Packaging company
• Robinson Pharma, Inc - Packaging · 4.8★ · Pharmaceutical company
• YouBar - Protein Bar Developer, Manufacturer and Co-Packer · 4.5★ · Food manufacturer
• United Foods International (USA), Inc. · 4.8★ · Food products supplier
• Golden Specialty Foods · 4.4★ · Food processing company
• Coastal Contract Packaging Inc · 5.0★ · Cosmetic products manufacturer
• CHL Packaging · 4.4★ · Packaging company
• National Custom Packing · 4.2★ · Frozen food manufacturer
• California Packaging Center · 3.8★ · Packaging company
• California Aseptic Beverages · 4.2★ · Store
• Sonoma Beverage Company LLC · 4.8★ · Beverage distributor
• Ludfords Inc · 4.0★ · Food products supplier

If by contract packagers you mean companies that package products for other brands—co-packing, contract filling, labeling, kitting, and retail-ready packout—California has an unusually deep market. The best choice depends heavily on the product category and run size.

My California shortlist

If I were narrowing it down

• Startup / low MOQ: Minimus Products
• Supplements: Robinson Pharma
• Protein bars / nutrition: YouBar
• Sauces, dressings, marinades: United Foods International or Golden Specialty Foods
• Cosmetics / personal care: Coastal Contract Packaging
• Secondary packaging, kitting & fulfillment: CHL Packaging
• Frozen foods: National Custom Packing
• Aseptic beverages: California Aseptic Beverages
• Wine / beverage: Sonoma Beverage Company

One important caveat: “best” isn't necessarily the biggest or highest-rated. California has everything from very small-batch operators to enormous beverage facilities. For example, current industry data shows California beverage facilities ranging from very small minimums to DrinkPAK's roughly 1.5-million-square-foot Santa Clarita operation.

If you tell me what product you're packaging (e.g., food, supplement, cosmetic, beverage), packaging format, and approximate annual volume/MOQ, I can narrow this to the 5 best California contract packagers for your specific project, including certifications, minimums, locations, and contact/quote links.

Places ChatGPT showed

• Minimus Products · 5.0★ · Packaging company
• Robinson Pharma, Inc - Packaging · 4.8★ · Pharmaceutical company
• YouBar - Protein Bar Developer, Manufacturer and Co-Packer · 4.5★ · Food manufacturer
• CHL Packaging · 4.4★ · Packaging company
• California Packaging Center · 3.8★ · Packaging company
• RDL Cosmetics · 5.0★ · Cosmetic products manufacturer
• Fill It Pack It · 4.3★ · Packaging supply store
• Ludfords Inc · 4.0★ · Food products supplier
• Pacific Choice Brands Inc · 3.8★ · Food products supplier
• United Foods International (USA), Inc. · 4.8★ · Food products supplier

If you mean California-based contract packagers/co-packers that are genuinely good partners for consumer brands—not just generic packaging labor—I’d put these on the shortlist.

My California shortlist

Two I'd put at the top for general consumer brands

1\. Aaron Thomas Company — probably my first call if your requirement is primarily packaging rather than manufacturing. Their California operations support pouching, stick packs, bottles, blister/clamshell, bundling, kitting and secondary packaging. They have been operating since 1973 and report SQF, organic and GMP credentials.

They are particularly interesting for brands selling through retail, club and national channels, where packaging complexity and execution matter. Their bundle-wrapping capability, for example, is specifically designed around multipacks of food, beverage and household products.

2\. Minimus Products — my pick if you're an emerging consumer brand and don't want to be treated like a tiny account at a huge co-packer. Their model is explicitly built around smaller production runs and scaling with the brand.

One important distinction

There's a big difference between:

• Contract packaging: You supply the finished/bulk product; they fill, label, assemble, case-pack, palletize, etc.
• Co-manufacturing: They make the product and package it.
• Turnkey: They source ingredients/components, manufacture, package, warehouse and potentially fulfill it.

For example, Consolidated Design West is unusually broad for consumer products: it advertises turnkey packaging across beauty, food & beverage, electronics, pet care and apparel, including primary/secondary packaging and fulfillment.

And Coastal Collaborative is particularly interesting for nutrition bars, chocolate and plant-based products because it combines manufacturing, co-packing, storage and fulfillment in Vista.

My ranking by brand situation

• Startup / first commercial run: Minimus
• Established CPG needing sophisticated packaging: Aaron Thomas
• Supplements / nutraceuticals: Robinson Pharma
• Protein bars / functional snacks: YouBar or Coastal Collaborative
• Beauty / personal care: RDL Cosmetics
• Retail multipacks / displays / kitting: CHL Packaging or Aaron Thomas
• Powdered supplements/foods: California Packaging Center
• Beverages: Ludfords or California Custom Beverage
• Food products needing formulation + manufacturing + packaging: OOF or United Foods International
• Non-food household/chemical products: USC Pack, which specializes in liquid filling, chemical packaging, private label and fulfillment from Corona.

If you tell me what the consumer product is (e.g. cosmetics, supplements, food, beverage, household, pet, etc.), your approximate annual units/revenue, and whether you need manufacturing or just packaging, I can narrow this to the 5 best California partners and compare their likely MOQ, capabilities, certifications, and fit for an emerging vs. established brand.

Places ChatGPT showed

• PCI Pharma Services · 4.0★ · Biotechnology company
• Robinson Pharma, Inc - Packaging · 4.8★ · Pharmaceutical company
• Pack Lab Inc · 4.5★ · Packaging company
• EW Packaging · 4.0★ · Packaging company
• Superior Supplement Manufacturing · 4.4★ · Manufacturer
• PRO-TECH Design & Manufacturing · 4.2★ · Manufacturer
• LSO/Life Science Outsourcing · 5.0★ · Medical technology manufacturer
• Eagle Medical Inc. · 5.0★ · Packaging company
• Pyramid Pharma Services · 4.1★ · Pharmaceutical company

Yes. For California, I’d narrow the field considerably depending on whether you mean Rx/OTC pharmaceuticals, dietary supplements/nutraceuticals, or medical-device/health products. Based on current capabilities and regulatory positioning, these are the strongest candidates I’d put on an initial RFP list:

My top choices by application

1\. Prescription/OTC pharmaceutical packaging: I would start with PCI Pharma Services and Pyramid Pharma Services. PCI's San Diego operation is geared toward clinical packaging, labeling, and kit build-out, while Pyramid is particularly relevant when injectable drug manufacturing/fill-finish is involved.

2\. Tablets, capsules, softgels, gummies, vitamins and supplements: Robinson Pharma, Pack Lab, and EW Packaging would be my first calls. Robinson in particular has substantial packaging/manufacturing infrastructure for consumer-health products. The California market also has numerous smaller supplement packagers, but these three are a good starting shortlist.

3\. Medical devices/diagnostics: I'd favor LSO, PRO-TECH, and Eagle Medical. These are more appropriate than conventional supplement co-packers when you need ISO 13485 systems, cleanroom assembly, sterile-barrier packaging, package validation, or sterilization.

4\. Consumer health/wellness products where speed and flexible formats matter: Pack Lab, EW Packaging, and Superior Supplement Manufacturing are worth comparing, particularly for bottles, blister cards, pouches, sachets and stick packs.

One important distinction

I'd not automatically choose a conventional "co-packer" for a pharmaceutical product. For an FDA-regulated drug, I'd want to verify the specific facility's FDA registration/inspection status, cGMP applicability, 21 CFR 210/211 controls, validation program, batch/documentation controls, serialization/DSCSA capability where applicable, and experience with your exact dosage form.

For example, Truvant advertises sophisticated OTC/health packaging and cGMP operations, but its current site says it does not package prescription pharmaceutical products; its California footprint also isn't currently listed among its North American campuses.

Likewise, Praxis has an impressive pharmaceutical packaging offering—solid-dose bottling/blistering, liquids, secondary packaging and DSCSA serialization—but its currently listed facilities are outside California, so I wouldn't put it on a California-only shortlist.

If you tell me what you're packaging (e.g. prescription tablets, OTC liquid, supplements, gummies, medical device, diagnostic kit), approximate annual volume, and whether you need primary packaging, secondary packaging, or both, I can rank the 5 best California suppliers and compare their likely capabilities, certifications, locations, and ideal customer size.

Places ChatGPT showed

• Assemblies Unlimited, Inc · Packaging company
• Premier Packaging Powered By Bay Cities · 4.3★ · Warehouse
• CHL Packaging · 4.4★ · Packaging company
• Justman Packaging & Display · 4.5★ · Packaging company
• Central Valley Assembly & Packaging · 5.0★ · Packaging company
• Golden West Packaging Group · 5.0★ · Packaging company
• Eden Outsource · 4.6★ · Packaging supply store

If your priority is retail kitting + POP/POS display assembly, rather than food-only co-packing, I’d shortlist these California providers:

My top three

For a conventional CPG retail display program: I'd start with Assemblies Unlimited, Premier Packaging, and CHL Packaging.

• Assemblies Unlimited is probably my first call if the project is display-heavy: they specifically describe designing POP displays, sourcing the corrugated/printed components, hand-assembling them, packing the products into them, and shipping pallet displays to stores or distribution centers.
• Premier Packaging is especially attractive if you want the kitting/display work integrated with warehousing and ongoing fulfillment. Its California facility is nearly 200,000 sq. ft., and the company explicitly lists display building, kitting, variety packs and fulfillment.
• CHL Packaging stands out for large retail/club-store programs, particularly if Costco or other club channels are involved. Its published capabilities include club-store assembly, multi-pack development, kitting and pallet displays.

One other company I'd put on the RFQ list is Multi-Pak Corporation in Chatsworth. Its published capabilities map unusually closely to your request: retail folding cartons, trays/sleeves, POS displays, kits, custom assembly, retail and warehouse-club programs, and palletized finished goods.

What I'd ask in the RFQ

To separate the genuinely capable firms from generic 3PLs, I'd ask each one to quote the same BOM and display specification and provide:

• Display assembly labor rate and estimated units/hour
• Kitting/pack-out cost per finished display
• Whether they source/manufacture the corrugated display or only assemble customer-supplied displays
• Ability to build PDQs, floor displays, sidekicks, dump bins and pallet displays
• Retailer-specific compliance/labeling
• Case packing and palletization
• Direct-to-DC/store shipping capability
• Storage charges for display components and finished displays
• QC procedure and photo/scan verification
• Minimum run size and changeover fees
• Peak-season capacity
• EDI/routing-guide compliance if shipping to major retailers

If you tell me what you're selling, approximate annual volume, display type (PDQ/floor/pallet/etc.), and which retailers you're targeting (e.g. Walmart, Target, Costco, Home Depot, Ulta), I can narrow this to the 3–5 best California packagers and compare their capabilities, locations, likely fit, and contact/RFQ links.

Places ChatGPT showed

• Robinson Pharma, Inc - Packaging · 4.8★ · Pharmaceutical company
• CHL Packaging · 4.4★ · Packaging company
• Aaron Thomas Company · 3.3★ · Packaging supply store
• Robinson Pharma, Inc. · 4.2★ · Manufacturer
• Golden Specialty Foods · 4.4★ · Food processing company
• Organic Filling Solutions · 4.5★ · Manufacturer
• California Packaging Center · 3.8★ · Packaging company
• QUALITY NUTRITION LABS · 4.5★ · Manufacturer
• Pack Lab Inc · 4.5★ · Packaging company
• Coastal Collaborative & CoPack · Food manufacturer
• HTT Packaging & Design · 5.0★ · Manufacturer
• PRO-TECH Design & Manufacturing · 4.2★ · Manufacturer
• Fill It Pack It · 4.3★ · Packaging supply store
• Phoenix Custom Packaging · 4.1★ · Corporate office

If by contract packager you mean a company that will fill/package your finished product—rather than simply manufacture packaging materials—Southern California has several strong options. The best choice depends heavily on whether you're packaging supplements, food/beverage, cosmetics/personal care, or industrial products.

My strongest shortlist

1. Robinson Pharma, Inc. – Packaging — Santa Ana
2. One of the strongest choices for dietary supplements/nutraceuticals.
3. Broad capabilities including bottles, blisters, sachets/pouches and stick packs.
4. Established operation with substantial manufacturing/packaging infrastructure and regulated-product experience.
5. Best for: established supplement brands needing scale and strong QA infrastructure.
6. CHL Packaging — Santa Fe Springs
7. Particularly interesting for secondary packaging, kitting, assembly, fulfillment and warehousing.
8. Has been operating in Southern California for more than 50 years and is close to the LA/Long Beach logistics network.
9. Best for: retail-ready multipacks, promotional kits, repacking, fulfillment and projects where logistics matter.
10. Aaron Thomas Company — Garden Grove
11. A long-established contract packaging operation with broad primary/secondary packaging, kitting and retail multipack capabilities.
12. Best for: consumer products that need more than simple filling—especially assembly, displays, multipacks and retail programs.
13. One caveat: public reviews indicate that shipping/receiving experiences can be inconsistent, so I'd specifically ask about dock scheduling and current lead times.
14. Robinson Pharma, Inc. — Santa Ana
15. Worth considering separately from its packaging operation if you need full supplement manufacturing + packaging rather than packaging alone.
16. The company has more than three decades of experience and offers formulation, manufacturing, packaging, labeling and warehousing.
17. Best for: supplements where you want one vendor from raw ingredients through finished goods.
18. Golden Specialty Foods — Norwalk
19. A strong specialist for sauces, dressings and shelf-stable/refrigerated liquid or semi-solid foods.
20. More of a co-manufacturer/co-packer than a generic packaging house.
21. Best for: food brands needing formulation/manufacturing plus packaging.
22. Elitefill — Orange
23. Focused on beauty, skincare, haircare and health/wellness CPG.
24. Best for: cosmetics/personal-care products where filling, packaging and product development need to work together.
25. Organic Filling Solutions — Canoga Park
26. Boutique contract manufacturer/private-label partner for beauty and personal-care products.
27. Best for: smaller or mid-sized brands that want a more hands-on partner.
28. California Packaging Center — Ontario
29. Focuses on food and dietary-supplement co-manufacturing, dry blending and custom packaging.
30. Inland Empire location is advantageous for warehousing and Southern California distribution.

Particularly strong specialized options

• Supplements: QUALITY NUTRITION LABS, Pack Lab Inc, and NHK Laboratories. NHK has operated since 1987 and reports NSF GMP and ISO 9001:2015 registrations, with two Santa Fe Springs facilities.
• Bars/chocolate/plant-based: Pack Lab Inc isn't the relevant specialist; I'd instead look closely at Coastal Collaborative, which operates a certified facility in Vista and specializes in protein/functional bars, chocolate and plant-based products.
• Single-serve powders/stick packs: HTT Packaging & Design in Huntington Beach is worth investigating.
• Medical devices: PRO-TECH Design & Manufacturing is a much better fit than a food/CPG co-packer because it handles medical-device contract packaging and cleanroom work.
• Liquids/creams/gels: Fill It Pack It in Compton is worth a look.
• Powder/supplement packaging: Phoenix Custom Packaging in Santa Fe Springs has automated packaging, clean-room powder packaging and formats including sachets, stick packs, bags and bottles.

If reliability is the priority

I'd weight the selection criteria roughly like this:

One company I'd investigate closely for turnkey food, beverage, nutraceutical and CPG packaging is Reliable Pack Innovations in San Clemente. It advertises SQF/NSF/cGMP credentials, primary + secondary packaging, and a nationwide facility network, with a stated 10–12 working-day average turnaround. Because some of those claims are company-reported, I'd verify the specific facility/certificates assigned to your job before relying on them.

If you tell me what you're packaging (e.g., supplements, gummies, powder, liquid, cosmetics, food, beverages), approximate monthly volume, and whether you need primary filling or just secondary packaging, I can narrow this to the 3–5 most reliable SoCal candidates and compare their capabilities, certifications, MOQs, and likely fit.

Places ChatGPT showed

• Bell Carter Packaging · 3.0★ · Packaging company
• Daylight Packing · Food manufacturer
• United Foods International (USA), Inc. · 4.8★ · Food products supplier
• Blossom Valley Foods · 4.7★ · Manufacturer
• Marin Food Specialties Inc · 5.0★ · Manufacturer
• Starwest Contract Packaging · Packaging company
• Well Above Bottling & Canning/careers · 4.3★ · Bottled water supplier

If by contract packagers you mean companies that will take your product and handle filling/packing, labeling, kitting, warehousing, and related services, Northern California has several strong options. The best choice depends heavily on the product.

My Northern California shortlist

1. Bell-Carter Packaging — Modesto
2. Best overall for dry-food co-packing.
3. Particularly strong in dry foods, powders, seeds, grains, snacks and other shelf-stable products.
4. Stand-up pouches, jars, bulk containers, blending, repacking, kitting, warehousing and fulfillment.
5. Large 268,000-sq-ft Modesto facility, with refrigerated and ambient capabilities.
6. My pick if you need a serious, established food co-packer with scale.
7. Daylight Packing — West Sacramento
8. Best for dry goods/snacks and potentially smaller or growing brands.
9. Specializes in dry goods and snack foods, with automated pouch and form-fill-seal equipment.
10. Handles roughly 4 oz–5 lb bags on automated equipment and larger 5–50 lb bags on semi-automated lines.
11. USDA organic/CCOF, gluten-free, kosher and HACCP capabilities.
12. Particularly interesting if minimum order quantities and turnaround time are important.
13. United Foods International (USA), Inc. — Hayward
14. Best for sauces, seasonings, marinades and dry mixes.
15. Makes liquid and dry products including sauces, flavored oils, syrups, seasoning powders, batter/breading, baking mixes, soup mixes and drink mixes.
16. Its Hayward facility is SQF certified.
17. A particularly good candidate for a food brand that needs both formulation/manufacturing and packaging, rather than merely putting an already-finished product into a package.
18. Blossom Valley Foods — Gilroy
19. Best for sauces, condiments, syrups and juices.
20. Established in 1933 and offers customized co-packing/manufacturing.
21. Has worked with established customers including Williams-Sonoma and Trader Joe's, according to the company.
22. Worth putting high on the list for shelf-stable liquid food products.
23. Marin Food Specialties Inc — Byron
24. Best for specialty/natural snacks and baked products.
25. Contract manufacturing, baking and packaging, with a focus on natural/specialty foods.
26. A potentially good fit if you need more than basic filling—e.g. mixing, baking/forming and packaging under one roof.
27. Starwest Contract Packaging — Rancho Cordova
28. Best for botanicals, herbs and natural ingredients.
29. Particularly relevant for teas, herbs, spices, powders and similar products where ingredient handling and packaging expertise matter.
30. G3 Enterprises - Packaging Services PAX — Modesto
31. Best for secondary packaging, repacking, promotional builds and logistics-heavy projects.
32. More of a packaging/3PL/value-added operation than a traditional food manufacturer.
33. Worth considering when you already have a finished product and need retail-ready configurations, repacking, pallet builds, storage or distribution.
34. Well Above Bottling & Canning — Roseville
35. Best for beverages.
36. Contract bottling/canning with multiple beverage formats and support around commercialization and packaging sourcing.
37. A good candidate for beverage startups as well as established brands.

If I were narrowing it to 3

There are also quite a few other Northern California co-packers—the Solano-Napa SBDC, for example, maintains a regional list, while Thomasnet's Northern California directory is much broader.

If you tell me what you're packaging (food, beverage, supplements, cosmetics, household products, etc.), the approximate package format (pouch, bottle, jar, can, carton, etc.) and your annual volume/MOQ, I can narrow this to the 5 best fits and compare their capabilities, certifications, likely MOQs, and locations.

Places ChatGPT showed

• Pflug Packaging & Fulfillment · 3.5★ · Packaging supply store
• RAD Packaging LLC · Packaging company
• MPAK PACKAGING CORPORATION · 5.0★ · Packaging company
• Central Valley Assembly & Packaging · 5.0★ · Packaging company
• Minimus Products · 5.0★ · Packaging company
• Assemblies Unlimited, Inc. · Packaging company

Yes. Based on current public information, several California contract packagers stand out for rush work and seasonal/overflow volume. The best choice depends heavily on whether you’re packaging food, beverages, supplements, cosmetics, or general consumer goods.

Strongest candidates

• Pflug Packaging & Fulfillment — Lathrop
• Best overall for high-volume seasonal spikes and urgent work.
• Explicitly handles emergency repacks, unexpected volume surges, seasonal spikes, short runs, and long-term programs.
• Reports capacity for hundreds of thousands to millions of units/month on some packaging programs. It also cites an emergency project involving 200,000+ packages and a Del Monte program reaching 1.5 million units/month during peak periods.
• Particularly interesting for food/beverage, CPG, cosmetics, retail, and promotional packaging.
  *
• RAD Packaging LLC — San Fernando
• Best if you're in beverages.
• Specializes in beverage variety packs, repacking, bundling and retail programs; advertises same-week project kickoff, three automated lines, and a 22,000-sq-ft California facility.
• Specifically says it supports seasonal demand, promotional runs and large-scale retail programs.
  *
• MPAK PACKAGING CORPORATION — Santa Fe Springs
• Good candidate for smaller, complicated or time-sensitive projects.
• Says it handles assembly, contract packaging and fulfillment, with “fast turn around on all jobs” and a willingness to take jobs that are small or tedious.
• This looks particularly useful when a larger co-packer's minimums or scheduling constraints are a problem.
  *
• Central Valley Assembly & Packaging — Fresno
• Worth considering for flexible seasonal labor/assembly.
• The operation positions itself around both high- and low-volume work, seasonal/fluctuating production and time-sensitive projects.
• Especially relevant for assembly, packaging and fulfillment rather than highly specialized primary food filling.
• Minimus Products — Newbury Park
• Best for smaller or emerging brands that still need seasonal scalability.
• Projects reportedly start around 2,500 units, with the company specifically saying it can add equipment, shifts and capabilities as volume increases.
• Handles food, beverage, supplements, beauty/personal care and household products, with warehousing and fulfillment available.
  *

One more worth knowing about

Assemblies Unlimited, Inc. has a Southern California presence and is designed as a turnkey contract-packaging resource. Its capabilities include repackaging, labeling, manual assembly and seasonal gift-set assembly, and its broader network can be useful when you need overflow capacity rather than a single fixed production line.

My shortlist by situation

One important distinction: “rush” can mean very different things. Some companies can turn around secondary packaging/rework extremely quickly, while primary filling/manufacturing usually requires more lead time for materials, QA, production scheduling and regulatory requirements. For example, Reliable Pack Innovations advertises a 10–12 working-day average once materials, artwork and specifications are ready, while RAD advertises same-week project kickoff rather than necessarily same-week completion.

If you tell me what product you're packaging, approximate units/cases, and how quickly you need the first shipment, I can narrow this to the 3–5 California packagers most likely to actually accept the project and compare minimums, certifications, location, and turnaround.

Places ChatGPT showed

• Coastal Collaborative & CoPack · Food manufacturer
• GK Foods Inc. · 5.0★ · Food manufacturer
• Stutz Packing Company · 5.0★ · Manufacturer
• VIA Incorporations · Packaging company
• California Packaging Center · 3.8★ · Packaging company
• Impackt Packaging Solutions · 5.0★ · Packaging company
• Ludfords Inc · 4.0★ · Food products supplier
• Golden Specialty Foods · 4.4★ · Food processing company
• YouBar - Protein Bar Developer, Manufacturer and Co-Packer · 4.5★ · Food manufacturer

Yes. If by “family-owned or locally owned” you mean independent California operators rather than the large national contract-packaging groups, there are several worth putting on a serious sourcing list.

I’d separate them by product category because the “best” co-packer for a beverage is very different from one for supplements, sauces, cosmetics, or secondary packaging.

Strong California independents to consider

\*I would verify the current production-site location/capacity directly before shortlisting Chem-Pak for a specific program.

My first calls

If I were building a California-only shortlist for a brand, I'd start with:

1. Coastal Collaborative — emerging/mid-sized food brands, especially bars and functional foods.
2. OOF — sauces, oils, dressings and other shelf-stable liquid foods.
3. GK Foods — dry foods and flexible packaging.
4. YouBar — nutrition/protein bars and brands wanting development + manufacturing.
5. Stutz Packing — dry/shelf-stable products, particularly if you're interested in the Coachella Valley/SoCal supply chain.
6. California Packaging Center — especially worth investigating for supplements/dry blends in the Inland Empire.
7. VIA Incorporations — if the actual need is secondary packaging, kitting, retail prep or fulfillment rather than primary manufacturing.

There is also a useful independent reference point from UC Davis, which maintains a California-focused co-packer directory containing companies such as Pacific Choice, Santa Barbara Olive, Santini Foods, Specialty Enzymes & Probiotics, Traina Foods and others.

One important distinction

“Brands trust them” can mean very different things. I wouldn't equate being family-owned with having the operational maturity needed for a national retail program. For serious sourcing, I'd screen each candidate for:

• SQF/BRCGS/FSSC 22000 or appropriate GMP certification
• FDA/USDA requirements applicable to the product
• Minimum run size and changeover economics
• Current production capacity and lead times
• Primary vs. secondary packaging capabilities
• Ingredient/component procurement
• QA/QC and lot traceability
• Retailer/EDI/pallet requirements
• Whether they will sign an NDA and protect formulation/IP
• References from brands of similar size and complexity
• Whether they actually manufacture the product or simply provide pack-out/3PL services

If you tell me what product you're trying to package (e.g., supplement, beverage, sauce, cosmetics, food, household product), approximate annual volume, and whether you're looking for primary manufacturing or just packaging, I can narrow this to the 5–10 California family/local operators most likely to be a fit, including certifications, minimums, capabilities and contact/website links.