Why a Proof-of-Concept Run Should Be Your First Step in Co-Packing

Every brand that has skipped the proof-of-concept run has eventually wished they hadn't. Every brand that has done one has wondered why they were ever tempted to skip it. The math is simple: a small test run that catches a problem costs a few hundred dollars. A full production run that reveals the same problem can cost thousands — in wasted ingredients, scrapped film, rework labor, and lost time.

What a proof-of-concept run actually tests

A proof-of-concept run is a small-scale production test — typically 10 pounds of your product on a sample roll of your target film — that answers four questions you cannot answer any other way:

Does your powder flow? Most powders flow fine through a form-fill-seal machine's hopper and auger system. Some don't. Highly hygroscopic powders can bridge in the hopper, clump in the auger, or flow so inconsistently that fill weight varies dramatically from pouch to pouch. If your formula is missing a flow agent, or if the particle size is problematic, you find out here — on 10 pounds of product instead of your full ingredient order.

Is your sachet size right for your fill weight? Powder bulk density varies enormously by formula. A 30g fill of creatine monohydrate takes up a completely different physical volume than a 30g fill of a low-density electrolyte blend. The proof-of-concept run tells you your actual fill-to-pouch ratio on your specific product. If your sachet is undersized, you find out before you've printed 100,000 impressions of film.

Do you need custom auger tooling? The auger flight and die that meters powder into each pouch needs to match your product's characteristics and your target fill weight. If the co-packer doesn't have the right tooling in stock, they need to order it — and custom auger tooling typically costs $3,500–$4,500 per piece and takes several weeks to arrive. Finding this out before your production run date is the difference between a manageable lead time issue and a complete production delay.

What are your documented production parameters? Fill weight at specific auger speed, seal temperature, dwell time, throughput rate — these numbers live in your product's production record and are what the co-packer uses to set up your machine correctly on production day. Without them, every run starts with a calibration period full of startup waste. With them, you hit the ground running from the first pouch.

What a proof-of-concept run costs

At North Lakes, a proof-of-concept run is $525. You send us 10 pounds of your product and a small sample roll of your target film. We run it, document the parameters, identify any issues, and give you everything you need to move to a full production run with confidence.

Against the cost of discovering any of the above problems on a full production run — where you've already received all your ingredients, booked your run date, and committed your film order — $525 is not a cost. It's insurance.

The sequence matters

The right order is: proof-of-concept run first, full ingredient order second. Not simultaneously, and definitely not reversed. Don't ship your full ingredient order until after the proof-of-concept run confirms your product runs cleanly on the machine. If the proof-of-concept run reveals a sachet size issue or an auger tooling gap, you can address it before you've received 500 pounds of ingredients that are now sitting in a facility waiting on a corrected film order.

What makes a proof-of-concept run unnecessary

If you've run the same formula on the same machine at the same co-packer before, you have documented production parameters and the proof-of-concept run is redundant. If you're switching co-packers or changing your formula, even if you've been making this product for years, treat it like a first run. A new machine, new auger tooling, and new production parameters mean you're essentially starting from scratch.