Self-Seal Foil Bag Sizes: Bag Body, Flap and Packed Fit
YUANEN lists its flat self-seal foil bags as width × bag-body height + a separate flap. That distinction matters when a rigid takeaway box has to pass through the opening and leave enough material for closing. Start with the packed box and confirm the fit in a finished sample.
Read the extra flap separately
On the self-adhesive foil bag page, 15 × 20 + 4 cm means a nominal width of 15 cm, a bag-body height of 20 cm and an additional 4 cm flap. The flap folds over to make the closure. Do not treat the combined 24 cm as usable packing depth. Side seals, the opening and the loaded shape still need to be checked with the sample.
Measure the box in its packing position
Measure the closed container, including the lid rim and any sleeve or outer wrap. If you pack several boxes together, record the whole stack. Send a top-and-side photo or sketch showing the intended orientation. A flat bag’s width does not establish how a box with depth will pass through its opening; the finished bag must accommodate the corners and the closing movement.
- Include any coolant or protective material that will share the bag. Its dimensions belong in the packed layout.
- Tell the supplier which box must stay upright and where pressure on the lid is unacceptable.
Check loading and closing in one sample trial
Load the sample with the intended containers. Check whether they enter without forcing the side seals, whether the flap folds onto its intended contact area, and whether the closed bag presses on a lid or leaves an opening. Ask the supplier to distinguish nominal finished dimensions from usable opening width and to record the flap overlap on the approved specification.
If a deep or wide box makes the flat pouch difficult to load, compare it with YUANEN’s gusseted self-seal format before fixing the order size. A gusset changes the packing geometry; it does not establish thermal performance. Test the complete loaded system for the intended route and temperature conditions.
Send the fit record with your enquiry
Send the packed dimensions and orientation, preferred flat or gusseted format, bag-body and flap dimensions, proposed layer structure, quantity, artwork and destination. Include photos of the loaded and closed sample when available. Ask YUANEN to confirm the finished dimensions, dimensional tolerance and sample reference in the quotation. This gives the supplier a fit requirement to review rather than only a size label.
Sources and scope
YUANEN prepared this article with AI assistance. Check the cited source and confirm product specifications for your order. This article is not a product test report or a regulatory certification.