A liner that looks neat from above can still leave difficult corners at the bottom of a soft cooler bag. Containers may press into a fold, crumbs may collect behind an attachment, or a rigid tray may stop short of the usable base. For a custom program, review the corner construction with the intended load and cleaning routine before approving the sample.
Look at the inside shape, not only the outside size
Measure the usable base where a tray actually rests. A rounded internal corner and a square tray can consume space differently from a flexible food pouch. Record the narrowest clear area rather than assuming the external dimensions equal the usable interior.
Ask for an open view with the lining visible. Do not cut a production sample or detach a bonded liner without an agreed investigation method. If the team needs a construction section or development sample, request that specifically.
Separate a fold from a liquid-retention requirement
A visible fold is not enough to decide whether the liner will hold liquid. The joints, attachment and opening design matter. Likewise, a smooth corner is not proof that a complete bag is leakproof. Define any required liquid check separately from the visual review.
If loose ice or meltwater is part of the use, tell the factory at the RFQ stage. A bag intended for sealed containers and cooling packs should not silently be evaluated as a bucket for uncontained water.
Review cleaning without damaging the construction
Use the proposed cleaning instructions and inspect whether a cloth can reach the bottom and corners. Check the underside of removable inserts and any fastener that remains inside. Record where residue is difficult to see or remove.
Do not assume that a liner tolerates soaking, strong disinfectants or machine washing. Cleaning compatibility depends on the specific materials and construction. Ask for a project-specific instruction and, where necessary, an agreed compatibility review.
Describe the revision precisely
An actionable note identifies the corner, the interfering container and the requested change. An illustrative request might be to increase the clear base footprint for a stated tray while retaining the approved outside size. The factory then needs to review whether that combination is feasible.
After a revision, recheck packing and closure. Improving a corner may change the liner pattern, usable volume or space around an insulation layer. Update the sample record rather than approving only a close-up image of the improved detail.
Purchasing worksheet
Use this as a project worksheet, not a completed test report. Swipe the table on a small screen.
| Area | What to compare | Evidence |
|---|---|---|
| Base corner | Tray footprint versus clear inside space | Photo with the actual tray |
| Liner joint | Intended liquid exposure and construction | Agreed check, if required |
| Cleaning access | Cloth access and residue traps | Before-and-after observation |
Buyer FAQs
Can outside dimensions confirm that a square tray fits?
No. Check the finished inside footprint, corner shape and loading path with the actual tray.
Is a cleaner-looking liner automatically leakproof?
No. Appearance and liquid retention are different review items.
Explore our cooler bag collection alongside the project worksheet below.
Prepare your Weierken project brief
Send the container drawing or dimensions, a loading photo and your cleaning expectations. State whether liquid containment is required so the development review uses the correct scope.
Related guidance: liner construction, base-panel design. Send your project details to Weierken.
From brief to sample
Build the right bag for your collection.
Share the intended use, product format, quantity and destination market. Weierken can review the construction and sampling requirements with your team.
Discuss your bag project Explore OEM & ODM