C-Line Reusable Poly Envelope, Hook and Loop Closure, Side Loading, Letter Size, Pack of 36, Assorted Colors (58000-36) Poly Extra Large Reusable Envelopes are made from acid-free polypropylene Hook and loop closure (similar to VELCRO Brand closure) secures documents in place Side loading (loads on long side) for convenience For 8-1/2 x 11 inch document storage Assorted colors include blue, aqua, purple, pink, smoke and clear (36 envelopes total) Pack of 36