On this page
A chip that goes stale in six weeks or a granola that tastes like old oil is a packaging problem more often than a recipe problem. For dry snacks, the enemies are oxygen, moisture, light and rough handling, and the defences are chosen before the first bag is filled. Here’s how to think about shelf life, allergens and labels with your co-packer.
Why snacks go stale before they go bad
Most dry snacks are low in moisture, so microbes are rarely the issue. Instead, fats in nuts, seeds, fried chips and popcorn oxidize when exposed to oxygen and light, creating off flavours long before the product is unsafe, while humidity softens crisp textures. That makes shelf life largely a function of the package barrier and how much oxygen is left inside it.
Barrier films: read the spec, not the finish
Two pouches can look identical and perform very differently. Multi-layer, high-barrier film structures limit oxygen, moisture and light transmission, while thinner or single-layer films may be fine for short-life products. When comparing options, ask for the barrier specification of each structure and match it to your target shelf life. Format matters too:
- Stand-up pouches with zippers suit granola, nuts, dried fruit and premium popcorn.
- Lay-flat or three-side-seal pouches are economical for single servings and samples.
- Quad-seal bags handle heavier fills with a box-like shape.
- Roll stock runs on form-fill-seal equipment for high-volume chips and pillow bags.
If you’re buying pouches yourself, our partner Mylar Bags Canada carries stand-up and mylar bag options worth comparing against your barrier needs. Our packaging formats guide covers every format we work with.
Nitrogen flushing: when it’s worth it
Nitrogen flushing replaces much of the oxygen in the package headspace with nitrogen before sealing. It slows rancidity and gives the bag a cushion that protects fragile chips. It’s most useful for nuts, fried snacks and anything with meaningful fat content. If you need it, ask a co-packer three things: whether the line can flush, how residual oxygen is verified, and whether your chosen film holds the gas well enough for your target shelf life.
Fill weight and breakage
Snacks are light and bulky. Under-filled bags draw complaints; over-filled ones crush product during sealing and shipping. Ask how fill weight is controlled and checked, and how fragile pieces travel through the line.
Allergen changeovers in shared facilities
Allergen management is the single biggest regulatory risk in snacks. Health Canada’s priority allergens include peanuts, tree nuts, sesame, soy, milk, eggs, wheat and triticale, mustard, fish, crustaceans and molluscs, and sulphites, and trail mixes, granola and seasoned chips often contain several at once. The CFIA expects priority allergens, gluten sources and added sulphites to be declared on the label, and a cross-contamination (“may contain”) statement where an allergen could be present unintentionally. Health Canada notes that when the CFIA learns of a serious hazard such as an undeclared allergen, the product is recalled and a public warning is issued.
Questions to ask:
- Which allergens are handled in the facility and on the line you’d use?
- How are runs scheduled around allergens, and how are lines cleaned between changeovers?
- How is cleaning verified, and what records are kept?
- How do you make sure the right label goes on the right product?
Labels and the 2026 front-of-package rules
Since January 1, 2026, the CFIA has required compliance with front-of-package nutrition rules. Foods that meet or exceed Health Canada’s thresholds for saturated fat, sugars or sodium need the “High in” symbol, and Health Canada’s own examples include a bag of popcorn. Salted chips, sweetened granola and coated snacks are likely candidates. Printed film often has long lead times and minimums, so confirm your Nutrition Facts values before ordering. The usual essentials still apply: common name and metric net quantity on the principal display panel, a bilingual ingredient list, name and principal place of business, Nutrition Facts, and a best-before date where durable life is 90 days or less.
Lot codes that limit recalls
Where SFCR traceability rules apply, consumer prepackaged food needs a lot code. The CFIA suggests defining a lot by production conditions, such as day, shift and line, because a narrower lot can limit the scope of a recall. Agree on the definition and the print location with your co-packer before the first run.
Snack co-packing with COPACK Canada
COPACK Canada co-packs chips, popcorn, granola, and dried fruit and nuts, and sources stand up, lay flat and quad seal pouches and roll stock films. See snack co-packing for details, or request a free quote.
FAQ
How long do packaged snacks last?
It depends on fat content, packaging barrier and how much oxygen is left in the package. Shelf-life testing on your actual product and package is the reliable answer.
Do I need a “may contain” statement?
If a priority allergen could be present through unintended cross-contamination, the CFIA expects a cross-contamination statement.
Does popcorn need the front-of-package symbol?
Only if it meets or exceeds the thresholds for saturated fat, sugars or sodium. Many flavoured popcorns will, so check your values.
Sources
- Health Canada, Common food allergens (canada.ca)
- CFIA, Food labelling requirements checklist (inspection.canada.ca)
- Health Canada, Front-of-package nutrition symbol (canada.ca)
- CFIA, Implementation of the FOP labelling amendments (inspection.canada.ca)
- CFIA, Selecting a lot code to meet traceability requirements (inspection.canada.ca)
This article is general information, not legal, regulatory or food safety advice. Confirm requirements with the CFIA and a qualified advisor.