Designed to be the "Iron Man" of end-tab file pockets, this virtually indestructible file pocket won't rip out, even when pulled from the shelf by the gusset. Full-height gusset is fully lined with tear-resistant Tyvek, features special rollover reinforcement at the top and extends into the front and back panels twice as far as standard file pockets. Expansion is 3-1/2". Hidden reinforcement strip at the point of greatest stress adds to durability. Extra-wide pockets with straight-cut tabs accommodate standard, top-tab, letter-size file folders.