Custom Cooler Bag Sourcing Guide: Capacity, Insulation, Branding & MOQ
To source a custom cooler bag, work through five decisions in order: (1) capacity — size by can-count and usable litres, remembering that thick insulation reduces internal volume; (2) construction — pick the shell fabric (commonly 600D or 900D polyester), the lining (PEVA, or heat-welded TPU for a leakproof interior) and the foam type and thickness; (3) branding — printed or woven logo, custom colourways and retail packaging; (4) order economics — MOQ is set by the container, with a pre-production sample signed off before bulk; and (5) container math — usable litres and carton CBM together determine how many units land per 40ft high-cube. As an OEM/ODM private-label manufacturer, Trade Entrust builds each cooler bag to your brand — custom logo, colours and packaging — shipped container-direct worldwide. Cold-retention depends on ambient temperature, pre-chilling and how often the bag is opened, so it is stated as approximate rather than a fixed number of hours.
Updated July 2026
Step 1 — Size by can-count and usable capacity
Soft coolers are most intuitively sized by how many standard 330ml cans they hold, then cross-checked against usable litres. A rough industry mapping: small ≈ 6–12 cans, medium ≈ 12–24 cans, large ≈ 30+ cans. One practical caveat matters more than any single number: capacity is often quoted from outer dimensions, but insulation eats into it. A thick foam wall can reduce internal volume noticeably versus the outer-dimension figure, so a bag marketed at a given litre rating will deliver less usable space inside. When you sample, measure the *usable* interior with cans loaded, not the box footprint.
| Size class | Approx. can-count | Typical use | Notes |
|---|---|---|---|
| Small | 6–12 cans | Lunch, single-person outing, promo giveaway | Lightest, lowest cost |
| Medium | 12–24 cans | Day trips, family beach/park, delivery | Most popular retail size |
| Large | 30+ cans | Group camping, catering, tailgate | Heavier; check carry system |
Can-count and exact usable litres per model are confirmed on your OEM quote and shown on each product page. Match the size class to your buyer's shelf story before locking construction.
Step 2 — Shell, lining and foam: the construction stack
A cooler bag is three layers working together. Get each right and the rest of the spec follows.
Shell (outer fabric). Most soft coolers use polyester, commonly rated 600D for everyday retail and 900D for heavier-duty models; the denier (D) number indicates yarn thickness and broadly correlates with abrasion resistance. Higher denier and PU/TPU coatings add durability and water resistance at higher cost. RPET (recycled polyester) shells are available where a sustainability story matters.
Lining (interior). PEVA is the common food-safe, wipe-clean liner and pairs with a foam layer. For a genuinely leakproof interior, a heat-welded TPU liner removes stitched seams that can wick — the right choice if the bag will carry ice or wet contents. Aluminium-foil or metallic PE liners are used on lighter promotional bags.
Foam (insulation). EPE and EVA foams provide the insulating wall plus structural support; they are lightweight and hold shape. Insulation performance scales with foam thickness and lining seal — but real-world cold-retention depends on ambient temperature, pre-chilling and how often the bag is opened, so it is quoted as approximate, ambient-dependent, never as a fixed number of hours.
Every layer is OEM-customisable: fabric type/denier, liner material, foam thickness, zip and handle hardware. Base specs sit on each product page; upgrades are confirmed on quote.
Step 3 — Leakproof and closure options
Decide early whether the bag needs to hold ice-melt and wet contents, because it drives lining and closure choices.
- Wipe-clean, splash-tolerant (standard): stitched PEVA liner + foam. Fine for cans, groceries and dry contents; not designed to be watertight. - Leakproof interior: heat-welded TPU liner with sealed seams, so ice melt stays inside. Pair with a water-resistant zipper or a roll-top closure for the strongest seal. - Closures: standard coil zip (lowest cost), water-resistant zipper (better seal, moderate cost), or roll-top/hook-and-loop (best water resistance, easy one-hand access).
A leakproof build costs more and adds weight, so specify it only where the use-case justifies it. All of these are private-label configurable; the exact leak rating and closure grade are confirmed on your OEM quote after sampling.
Step 4 — Branding, MOQ and sampling
Because every model is an OEM/private-label base, you brand the bag rather than design tooling from scratch (full ODM is available on larger programmes). Branding levers: logo application (silk-screen or pad-print, or a woven label for a premium finish), custom colourways on shell and trim, custom zip pulls and hardware, and retail packaging with your hang-tags, barcodes and inserts.
MOQ is set by the container — typically one full container load (1 FCL) to start, and cooler base models can be mixed to help fill it. The exact per-model MOQ for branded production is confirmed on your OEM quote.
Sampling comes before bulk: we produce a pre-production sample with your logo, colours and packaging so you can inspect fit, usable capacity, lining seal and print quality and sign off before mass production. Pricing note: the storefront shows an indicative sample price; wholesale and quote pricing is by request. Specifications and carton CBM are public; wholesale pricing and a landed CIF estimate unlock for approved trade buyers, or request an OEM quote.
Step 5 — Container math: how many land per 40ft
Two live numbers drive your landed order: carton CBM (the cubic metres one export carton occupies) and units per carton. A 40ft high-cube container offers roughly 68 CBM of internal space, but you never fill 100% — a realistic stow efficiency of about 85–90% is normal once you account for pallet gaps and carton shapes.
Work it like this:
1. Usable CBM ≈ 68 × your stow efficiency (say 0.85 → ~58 CBM). 2. Cartons per container = usable CBM ÷ carton CBM. 3. Units per container = cartons × units per carton.
Cooler bags compress and nest well, so units-per-carton is usually high and a single 40ft HQ carries a large run. The exact carton CBM and units per carton are on each product page and confirmed on quote; our units-per-container guide shows a live worked example read from the real catalog.
Frequently asked
How do I choose the right cooler bag capacity?
Start from can-count: roughly 6–12 cans for small/lunch use, 12–24 for day trips and delivery, 30+ for group and catering use. Then check usable interior litres, not the outer-dimension rating — thick insulation reduces internal volume, so a bag marketed at a given litre figure holds less inside. Confirm usable capacity on the sample with cans loaded.
What lining should I choose for a leakproof cooler bag?
A standard stitched PEVA liner is wipe-clean and splash-tolerant but not watertight. For a genuinely leakproof interior that holds ice melt, specify a heat-welded TPU liner with sealed seams, ideally paired with a water-resistant zipper or roll-top closure. Both are OEM-customisable; the leak grade is confirmed after sampling.
How long will a custom cooler bag stay cold?
There is no fixed number of hours — real-world cold-retention depends on ambient temperature, whether contents are pre-chilled, ice or ice-pack volume, and how often the bag is opened. Thicker foam and a well-sealed lining improve retention. We describe performance as approximate and ambient-dependent rather than guaranteeing a set duration.
What is the MOQ for a custom cooler bag order?
MOQ is set by the container — typically one full container load (1 FCL) to start, and cooler base models can be mixed to help fill it. The exact per-model MOQ for branded production is confirmed on your OEM quote.
Can I brand the shell, lining, zips and packaging?
Yes. As an OEM/private-label manufacturer we customise shell fabric and colour, liner and foam, zip and handle hardware, your printed or woven logo, and retail packaging with hang-tags and barcodes. Larger programmes can go to full ODM with bespoke tooling.
Do I get a sample before bulk production?
Yes — we produce a pre-production sample with your logo, colours and packaging so you can inspect fit, usable capacity, lining seal and print quality before mass production. The storefront shows an indicative sample price; wholesale/quote pricing is by request.