Canada: Three Ways to Show a Woven Bag Is Acceptable for Food, and Which One to Use

Canadian establishments can rely on a Health Canada Letter of No Objection, a CFIA-listed acceptance, or a supplier letter of guarantee. Which to use.

Canada's food packaging regime is unusual in offering more than one acceptable way to demonstrate that a material is safe and suitable, and buyers who do not know that tend to reach for the most expensive route by default. A food establishment operating under the Canadian Food Inspection Agency's preventive controls can show that packaging materials are safe and suitable by relying on a previously issued CFIA letter of acceptance or no objection for materials already on the agency's reference listing, by holding letters of guarantee from suppliers or manufacturers, or by obtaining a Letter of No Objection from Health Canada. Which route fits depends on what is being packed and what the customer's own programme requires.

What a Letter of No Objection is, and what it is not

A Letter of No Objection from Health Canada communicates that, based on a safety evaluation, the department has no objection to the use of the subject products in the food packaging applications for which they are intended. It is a favourable opinion that recipients can use to assure their customers that a product has been evaluated and found acceptable for a specific use from a chemical-safety standpoint. Two features matter. First, it does not expire: it remains valid until the composition or use of the material changes from the original submission, or until the Food Directorate revises its position on the basis of new health-risk information. Second, it is not an approval in the legal sense and does not relieve food sellers of their own responsibilities.

The submission is voluntary for most packaging. Manufacturers and suppliers can request a pre-market assessment from Health Canada and obtain a letter to demonstrate compliance, but the mandatory requirement for Health Canada review is limited to food-contact materials used to package infant formula, foods for special dietary use and novel foods. For a woven bag holding rice, sugar, flour or feed, a Letter of No Objection is therefore an option rather than an obligation, and the decision to pursue one is commercial: it is the strongest document, it is durable, and it is the one a demanding customer is most likely to ask to see.

Choosing between the three routes

The reference-listing route is the cheapest where it applies, because the evaluation has already been done: if the material is already on CFIA's reference listing, the establishment can rely on the previously issued letter. The catch is that the listing describes a material and a use, and a woven bag is a construction of several materials, so the listing has to actually cover the layer in contact with the food as it is used, not merely a polymer of the same name. The supplier letter of guarantee route is the most flexible and the most common for industrial packaging, and it works well provided the letter is specific: construction, contact layer, resin grade, additive package, and lot traceability to the goods shipped.

The Letter of No Objection route makes most sense where the volume justifies it, where the customer's own supplier programme asks for it, or where the construction is unusual enough that a general supplier letter would invite questions. Because the letter stays valid until composition or use changes, it rewards stability: a buyer who standardises on one construction and keeps it can amortise the submission over years, while a buyer who changes lamination or liner every season will be resubmitting. That is a good argument for settling the construction deliberately rather than by default.

Canadian conditions and what they do to the specification

Canada's climate pushes woven packaging towards two requirements that warmer markets rarely consider together. Cold-weather handling matters because polypropylene stiffens at low temperature, and a bag that is dropped or dragged on a loading dock at well below freezing behaves differently from the same bag in a temperate warehouse. Seam construction and the fabric's cold impact behaviour deserve explicit attention where winter outdoor handling is expected. At the same time, agricultural products, feed and fertilizer that move between heated storage and cold transport generate condensation cycles that make moisture barrier a real requirement rather than a precaution.

Retail-facing agricultural products, which are a significant part of Canadian demand, add a print and appearance requirement on top. Print quality is largely a function of the lamination that carries it, which ties the appearance decision back to the barrier decision and, through the contact layer, to the food-contact file. All three are one construction choice seen from three angles, and making it once, deliberately, is what keeps the compliance documentation stable afterwards.

Three routes

CFIA reference listing, supplier letter of guarantee, or a Health Canada Letter of No Objection

Mandatory review only for

Infant formula, foods for special dietary use, novel foods

LONO validity

No expiry; valid until composition or use changes, or Health Canada revises its position

Letter of guarantee must name

Construction, contact layer, resin grade, additives, lot traceability

Cold handling

State winter outdoor handling so seam and impact behaviour are specified

Standardise

One stable construction amortises any submission over years

One category deserves separating out. An animal feed sack is a food-contact question in regulatory terms and a moisture question in practice, because pellets degrade once they take up humidity and Canadian storage cycles between heated buildings and cold transport. Where the product respires or arrives warm, a ventilated construction does the opposite job and is the correct answer instead. Settle which of the two applies before choosing a documentation route, since a change of construction invalidates evidence written against the previous one.