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Where Back Seal Mylar Bags Go Wrong: Misaligned Seams And Broken Back Panels
The back seam is the defining feature of a pillow pouch, and it is also the most common source of problems. When artwork ignores the seam, logos and barcodes get split down the middle, nutrition panels fold into the seal, and the back of the bag looks like an afterthought.
Seal quality is the other risk. A weak center seal can leak air or crumbs, and a wrinkled end seal looks unprofessional on shelf. On automated vertical form fill seal lines, inconsistent film or poor registration slows production and creates waste.
Well-made back seal mylar bags start with a seam-aware layout. We position the center seal so it splits the back into two clean panels, keep barcodes and required text clear of the seam, and choose film that seals cleanly at your line speed. For heavier or bulkier products, adding side gussets gives the pouch more volume, as explained in our gusseted mylar bags, without changing the clean front panel customers see.
