It is the most widely used packaging type in both horizontal and vertical packaging systems. It is the most accurate method in terms of strength. It can be produced with or without gusset. Back welded packs are generally used for coffee packs with 250 g or more capacity. It is designed to preserve the flavor and aroma of the product.

It has the same appearance as 4-sided welded packages, except that it is welded on the back of the package. Material Groups commonly used in back welded bags: PET/PE, BOPP/PE, PE/PE, PET/PET.MET/PE, BOPP/BOPP, BOPP/CPP