Keep project files, important documents and keepsakes secure in Toploading Translucent Expansion Envelopes. Made of durable polypropylene, they resist spills and tearing while protecting your lettersize documents. Acidfree material allows archivalquality storage. Clear envelopes are closed on three sides and expand to 11/4 to hold bulky items or more than 200 sheets of paper. Close the envelopes with the hookandloop closure.