Organize project files, important documents and keepsakes in standard threering binders with ThreeRing Expansion Envelopes. Made of durable polypropylene, they resist spills and tearing while protecting your lettersize documents. Threehole punched envelopes are closed on three sides and expand to 11/4 to hold bulky items or more than 200 sheets of paper. Made of acidfree material for archivalquality storage, clear envelopes feature a hookandloop closure for secure storage.