So, your family says you make the best salsa they’ve ever tasted, and they keep telling you to sell it. The problem is you don’t have the capital to build a commercial kitchen, hire workers, and set up a distribution network. You have a recipe and a lot of encouragement. That’s it.
I first ran into the answer to that problem in 2006, on a rainy day in the Adirondack Mountains. We were on an RV trip and looking for something to do indoors, so we took a factory tour of the West End Brewery in Utica, New York, home to the Saranac line of beers. The brewery has made beer since 1888 and is one of the nation’s oldest family-owned breweries.
As I watched one of the bottling lines run, I noticed the bottles coming off it didn’t say Saranac. They said Brooklyn Brewery. I was confused, so I asked our tour guide about it. He explained that the brewery bottled craft beer for other companies on contract. Brooklyn Brewery owned the beer and the brand. West End just ran the line.
That’s the whole idea in one scene. Somebody else owns the factory. You own the label.
What Is a Co-Packer?
In everyday use, a co-packer is a company that manufactures and/or packages a product for another company, under that company’s brand, to its recipe and specifications. You bring the product and the brand. The co-packer brings the equipment, facility, trained staff, and experience running production every day.
You’ll hear co-packers called by several other names: co-manufacturer (or co-man), contract manufacturer, contract packager, and even co-bottler. Technically, there’s a difference. A co-packer only packages a product someone else made, while a co-manufacturer actually makes it. By that definition, what the West End Brewery was doing for Brooklyn Brewery, and what most people with a product idea actually need, is a co-manufacturer.
But almost nobody uses that word. Most small business owners, and most of the people searching for help, say “co-packer” for both. So that’s the term I’ll use here, knowing it’s technically a little misapplied. If you’re talking to a manufacturer who makes the distinction, just know that what you’re asking for is co-manufacturing.
Not Just Food
Salsa makes a good example, and food and beverage get most of the attention, but co-packers work across a wide range of industries, including:
Health and beauty products such as cosmetics, skincare, and personal care items.
Dietary supplements and vitamins.
Pet food, treats, and grooming products.
Household and cleaning chemicals, such as detergents and cleaning solutions.
Industrial fluids such as lubricants, adhesives, and automotive fluids.
Pharmaceuticals use contract manufacturers too, but that’s a heavily regulated world of its own.
It’s also worth separating co-packing from two terms that get mixed up with it, and with each other: private label and white label.
With white label, a manufacturer makes one generic product and sells it to many companies, each of which puts its own name on it. Think of a cast-iron frying pan. The same foundry can pour the same pan for a dozen kitchen brands, each with its own logo stamped on the bottom. Same product, lots of different labels.
With private label, a third-party manufacturer makes and packages a product that’s sold under the buyer’s brand, often customized for that buyer and sometimes sold exclusively to them. Say a salsa manufacturer already makes a solid medium salsa. A regional grocery chain asks for a smokier version with chipotle and less salt, and sells it under its own store brand. The twist belongs to the grocery chain’s product, but the manufacturer usually still owns the base formula. Exclusivity controls who can sell that version. It doesn’t make the recipe yours.
With a co-packer, the formula is yours. You bring the recipe, and they make it to your specifications. That difference matters, because what you own is what you can build a business on, and we’ll come back to it.
Build It or Rent It: The Operating Leverage Decision
Most people think about a co-packer as a production decision. It’s really a business model decision.
If you build your own production, you take on fixed costs, and for most small businesses, fixed costs mean debt. Very few founders have the cash to pay for a facility, mixers, a bottling line, and the engineering to tie it all together, so they borrow. That loan becomes a principal-and-interest payment every month. Add payroll and compliance on top of it. The fixed costs on a line built to fill 50,000 jars a month are the same whether you sell 50,000 jars or 500.
That’s where operating leverage comes in. Operating leverage is about the mix of fixed and variable costs in your business, and how that mix behaves as sales go up or down. When most of your costs are fixed, every extra sale drops almost straight to profit once you cover the overhead. That’s high operating leverage, and it works well when sales are strong. But it cuts just as hard the other way. When sales come in below plan, those fixed costs keep coming, and the losses pile up fast.
So, when you’re starting out, you want low operating leverage, with most of your costs variable and tied to what you actually sell. If the product doesn’t take off, your downside is limited, because you aren’t paying for assets that you don’t use. Once you’ve proven you have a hit, that’s when high operating leverage starts to make sense. Go slow when you’re not sure. Lean in once the market has told you it’s worth it.
There’s another trap in building too early: sunk costs. Money you put into a production plant and equipment is mostly gone once it’s spent. You can’t easily get it back if things don’t work out. Worse, it creates pressure to keep pouring money into a product that isn’t working, just because you’ve already invested so much. That’s the sunk cost trap, and a factory is one of the most expensive ways to fall into it.
“Don’t build the plant. Rent somebody else’s.”
The question, then, isn’t just whether a cost is fixed or variable. It’s whether the fixed cost is a loan payment on something you own or something you rent. My answer for most product founders is simple. Don’t build the plant. Rent somebody else’s. A co-packer turns most of that fixed cost into a variable one. You pay per production run, so the cost shows up roughly when the sales do. If the product doesn’t sell, you haven’t borrowed a ton of money you have to pay back to find that out.
If you map it on the Business Model Canvas, the co-packer becomes a Key Partner that takes over one of your Key Activities, production. That shift changes your Cost Structure. What’s left for you is the part that actually makes you different: the recipe, the brand, and the relationship with the customer. Your real asset is the intellectual capital. The co-packer supplies the execution.
However, renting isn’t free. You trade a big fixed bet for a higher per-unit cost. That’s the right trade while demand is unproven, and often the wrong one at scale.
The Math Nobody Mentions: Minimums and Cash
Here’s where a lot of founders get surprised. A co-packer removes the upfront debt, but the cost doesn’t disappear. It moves.
Co-packers set minimum order quantities and charge you in two ways. First, there’s a setup and changeover fee for each run. That covers cleaning the line, switching it over to your product, and getting it running. That fee is roughly the same whether they make 1,000 jars or 10,000. In other words, even renting carries a small fixed cost on every run. It’s the same operating leverage as the plant, just at a scale where you can survive being wrong.
Second, they charge a per-unit cost for every jar they make. According to Eightx, a CFO firm that works with consumer product brands, small-batch sauce and condiment co-packers often start with a first run of roughly 500 to 3,000 jars, while beverage runs are typically much larger. Many co-packers also ask for a 30% to 50% deposit when you book the run, and they often require payment in full up front for printed packaging with long lead times.
Then look at the other end. Retailers commonly pay in 60 to 120 days. So you pay for the ingredients, the run, and the packaging months before the money comes back. A co-packer doesn’t eliminate your cash problem. It just changes its shape.
There’s one more catch. Per-unit cost falls sharply as order size grows because setup fees are spread over more units. That creates pressure to order more than you can actually sell. Your shelf life is the brake. A product that expires before you can move it isn’t a bargain at any per-unit price.
Prove It Before You Scale It
This is where I’d apply what I call the Ship of Gold. De-risk a venture in stages, and prove each stage before committing real resources to the next.
For a food product, the stages might look like this. Start in your own kitchen, selling at farmers’ markets under your state’s cottage food rules. Those vary widely, so check what yours allows before you start. Move to a shared commercial kitchen. Then a small-batch co-packer. Then a larger co-manufacturer. And only then, maybe, your own plant. Each step should be earned by the one before it.
It’s always smart to start small and see how the market responds. A co-packer fits that approach, but don’t mistake it for a growth strategy. You set the pace. They run the line.
Co-packers take you more seriously, and quote you more accurately, when you show up prepared. Before you make the first call, have these in hand:
A written product spec. That means the product name, ingredient statement, exact weights, every process step, packaging, and quality requirements. The best way to build it is to make the product yourself from start to finish, weighing and writing down everything.
Your numbers. Know your unit sales per month and per year, your cost of goods, and your shelf life.
Regulatory requirements vary by product category. Each has its own rules, and a co-packer will expect you to know yours. For salsa, barbecue sauce, or most other shelf-stable acidified foods, that means a scheduled process. That’s a tested, written procedure, approved by a food-safety expert called a process authority. It sets the acidity, heating, and packaging steps that make the product safe, and it has to be filed with the FDA before commercial production. A cosmetic like a hair tonic follows different rules, and so do supplements and pet products. University food science programs, industry associations, and prospective co-packers are good places to ask.
How to Find and Vet a Co-Packer
Finding a co-packer used to mean word of mouth and cold calls. Today you have better options. Start with co-packer marketplaces such as PartnerSlate, your state’s department of agriculture, university food innovation centers, and industry trade shows.
Plan to interview four to six co-packers, then narrow the list to two or three and tour their facilities. Ask for pricing after the tour, once they understand your product.
Questions worth asking:
What are your minimums and lead times?
Do you charge R&D or formulation fees?
Where do you source ingredients, and can I supply my own?
Do you offer storage?
What audits and certifications do you hold?
How much room do you have to grow with me?
Who owns the formula and any process changes you make to it?
One more question for food products: the FDA has pushed the compliance date for its food traceability rule, known as FSMA 204, out to 2028. Ask how a prospective co-packer is preparing for it.
What a Co-Packer Won’t Do for You
A co-packer makes the product. That’s the job. You still own sales, marketing, distribution relationships, and the cash flow cycle.
Some co-packers offer warehousing or fulfillment. That can be useful, but treat it as an add-on to negotiate, not a distribution strategy. Think back to the canvas. The co-packer took over one Key Activity. Every other box is still yours.
Back to the Brewery
Brooklyn Brewery started in 1988, and its early beer was contract brewed by that same brewery in Utica. In 1996, it opened its own brewery in Williamsburg, Brooklyn. Even then, it kept its bottled beer in Utica, because the new brewery didn’t have a bottling line. That’s why I saw Brooklyn labels coming off the Saranac line in 2006, 10 years after they’d built their own place.
That’s the whole progression in one company. Rent while you prove it. Build once the demand is real. And keep renting the parts that don’t set you apart.
Could you use the services of a co-packer to bring your product to market?
