The staggered plies, or stepped-end design, provides a strong sift proof closure on both ends of the bag. They work well on automatic filling and closing equipment. The folded ends will accommodate print on both top and bottom. (It is important to note that flush cut PBOM's are not as sift proof as the stepped-end closure.)
This style of bag is not well suited for products with inconsistent density. Unlike flush cut open mouth bag style that can be trimmed prior to closing, the length of a PBOM is fixed at its manufactured length because of the stepping and pre-applied hot melt.