Favored by law firms and other document intensive industries. Pockets will hold standard letter size top tab folders without bulging. TUFF pockets are virtually indestructible and will withstand years of heavy use, even when pulled from the shelf by the gusset. They have fully lined gussets and include a hidden reinforcement strip at the point of greatest stress. Accordion style sides expand 3-1/2" and hold up to 400 sheets. File pockets take up minimal space, expanding only when extra storage capacity is needed.