Bulk sounds simple — buy more, pay less per unit. But in Canada, the math gets complicated fast: shipping costs from U.S. suppliers, minimum order realities, storage space, and the risk of buying 500 mailers in the wrong size. Here's what you actually need to know before committing to a case order.
The term gets used loosely. In the packaging industry, bulk generally means one of three things:
For most small-to-medium Canadian sellers — eBay, Etsy, Shopify, Kijiji regulars — a single case is the practical bulk unit. That's the sweet spot where per-unit prices drop meaningfully without tying up capital or floor space.
Uline operates distribution centres in Toronto (Brampton), Calgary, and Vancouver, which means next-business-day ground shipping for much of the country. They stock poly and kraft bubble mailers in every standard size (#0 through #7 and beyond), and pricing drops noticeably at 100, 500, and 1,000 units. Uline's Canadian site prices in CAD. One caution: minimum orders can trip up smaller buyers — some lines require a full case to access case pricing, and Uline's shipping charges are real. Ordering a single case from their Calgary DC to rural Alberta still adds $15–30 in freight depending on weight. Pull up their site and calculate total delivered cost before assuming it's the cheapest option.
Staples sells bubble mailers in their stores and online, but their bulk options are limited compared to dedicated packaging suppliers. You'll typically find retail-pack quantities (10–25 units) in store. Online, Staples carries some case-quantity SKUs, but selection narrows to common sizes. Price-per-unit runs higher than Uline or EcomPack for equivalent quantities. Staples is most useful when you need something urgently and have a store nearby — or if you're buying a small secondary size you don't use often enough to justify a full case order elsewhere.
A Canadian-focused packaging supplier that's become popular with Shopify and eBay sellers. They sell kraft bubble mailers by the case (typically 50–100 units per case depending on size) and ship from Ontario. Pricing is competitive with Uline for smaller case quantities, and they market some products as Canadian-made. Worth getting a quote if you're in central Canada — their case pricing on #0 and #2 kraft mailers in particular tends to be sharp.
Costco Business Centres (separate from regular Costco warehouses) carry Crownhill Packaging bubble mailers in bulk cartons — typically 250 units of #0 poly mailers per case. The price per unit is competitive and there's no shipping cost if you pick up. The limitation is size selection: Costco stocks a very narrow range, usually just the smaller sizes. If #0 or #2 poly covers 90% of your needs, this is worth checking. Regular Costco locations occasionally carry bubble mailers too, but stock is inconsistent.
Amazon's bulk bubble mailer listings vary wildly in quality and actual unit counts. You'll find brand names (Sealed Air, Uline) alongside unbranded imports. Amazon works well for comparison shopping and for sizes you need to test before committing to a full case order elsewhere. The "Subscribe & Save" option provides modest discounts on repeat orders. Be careful reading listing dimensions — "usable interior" vs outer dimensions aren't always clearly labelled.
Most mid-to-large Canadian cities have one or two local packaging supply houses that aren't household names but serve commercial accounts. Search "[your city] packaging supplies wholesale" — you'll often find distributors that serve restaurants, retail, and e-commerce. They can quote on pallet orders, offer will-call pickup (saving freight), and sometimes cut deals on mixed-case orders. For high volume (1,000+ units/month), a local distributor relationship often beats any online supplier on total delivered cost.
These are general ranges to orient your math, not guaranteed current prices — check live pricing before ordering:
| Quantity | Poly #0 (approx.) | Poly #2 (approx.) | Kraft #4 (approx.) |
|---|---|---|---|
| 10–25 (retail pack) | $0.60–0.90/unit | $0.75–1.10/unit | $0.90–1.30/unit |
| 100 (1 case) | $0.35–0.55/unit | $0.45–0.65/unit | $0.55–0.80/unit |
| 500 (case lot) | $0.22–0.38/unit | $0.28–0.45/unit | $0.38–0.58/unit |
| 1,000+ | $0.16–0.28/unit | $0.20–0.35/unit | $0.28–0.45/unit |
Buying the wrong size in bulk is one of the more expensive mistakes small sellers make. Here's how the standard sizes map to real products:
| Size | Interior (approx.) | Best for |
|---|---|---|
| #0 | 6" × 9" | Jewellery, small cards, phone accessories, trading cards in toploader |
| #2 | 8.5" × 11" | Standard documents, small books, folded clothing, cosmetics |
| #4 | 9.5" × 13.5" | Medium books, soft toys, folded garments, board games |
| #7 | 14.25" × 19" | Large clothing, framed prints, vinyl records, bulky soft goods |
For most general Canadian resellers, stocking #2 and #4 in bulk covers the majority of shipments. Add #0 if you sell small items regularly. #7 is a niche — don't buy a case until you know you'll use 50+ per month.
Self-seal (also called "self-adhesive" or "easy-peel") mailers have a peel strip that exposes adhesive — you remove the strip, fold the flap, press. Most modern poly bubble mailers use this design.
For bulk use, self-seal is almost always the right choice. You gain speed (no moisture, no licking, no tools), consistent seal strength, and less hand fatigue over a packing session. Moisture-activated or peel-and-seal with a water step is slower and less consistent at scale.
When comparing cases, confirm "self-seal" vs "peel-and-seal" — some suppliers use the terms interchangeably but they're not always identical. Self-seal with the peel strip is the gold standard.
Both come in bulk. The choice depends more on your customers and products than on price (kraft typically runs 10–20% more per unit than equivalent poly).
The poly vs kraft question intersects with your Canada Post strategy. If you're shipping Expedited or regular parcels, the weight difference matters less. If you're stretching for Lettermail eligibility, every gram counts — poly wins there.
A case of 500 #2 poly bubble mailers isn't huge — roughly the size of a large moving box — but they need reasonable storage conditions:
| Supplier type | Typical MOQ | Notes |
|---|---|---|
| Uline Canada | 1 case (varies by SKU) | Some SKUs require full case; check their site for each size |
| EcomPack.ca | 1 case (50–100 units) | Canadian-focused, smaller minimums on some lines |
| Costco Business Centre | 1 case (250 units) | Limited size selection; no shipping (pick up only) |
| Staples Canada | No real MOQ | Retail pricing even on multi-case online orders |
| Local distributor | Varies — often 1 pallet | Best pricing, may require account setup; flexible on mixed cases |
Skip bulk if:
A reasonable approach for newer sellers: buy a retail pack of two or three sizes, ship 20–30 packages, see which sizes you actually reach for, then commit to a case order on your top two sizes. This trial run is worth it.