Co-manufacturing lets you scale production without owning the plant, and it's one of the most capital-efficient growth levers available. It's also where I've seen more operational disasters than almost anywhere else in a growing business, usually because the contract was negotiated on price and lead time while quality control got a single boilerplate paragraph.
Specify Before You Sign
I now write the quality specification before I ever discuss price with a co-manufacturer. Tolerances, testing protocols, batch documentation requirements, and what happens when a batch fails spec all get defined in writing, with named remedies, before a single unit is produced. Vague quality language is the single biggest source of disputes I've seen in these relationships, because both sides think they agreed to something different.
Batch traceability is non-negotiable for me. Every lot needs a paper trail back to raw material sourcing, because when there's a quality issue, and eventually there will be, the speed of your root-cause investigation determines whether it's a minor recall or a brand-damaging event.
Capacity Commitments Cut Both Ways
The other clause I never skip is capacity guarantee language, in both directions. I want a co-manufacturer contractually committed to a minimum production allocation for me during peak season, not just a best-efforts promise that evaporates when a bigger customer shows up. In exchange, I commit to minimum volume so the manufacturer can plan their own capacity around my business.
Co-manufacturing relationships that last years are built on contracts that anticipated the bad days, not just the good ones. Negotiate the quality failure scenario and the capacity crunch scenario up front, because those are the moments that actually test the partnership.