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Staples carries various sizes including the popular #10 size — ideal for folded 8-1/2" x 11" letterhead. Choose from an assortment of window envelopes with great features including gummed and self-sealing closures and plain and security tints. Popular brands include Quality Park, Ampad, Tyvek, and Staples, and you can also add a personal touch to your outgoing mail with our selection of custom envelopes.