Quality Park® Survivor® Tyvek® Expansion Envelopes, Open Side, 12" x 16" x 4", White, Box Of 50

Puncture Resistant; Tear Resistance; Water Resistant; Moisture Resistant; Heavyweight Expand to allow for easy insertion of bulky items like books, binders, catalogs, etc. Lightweight to help you save on postage - try these instead of a heavy box or carton. Made from lightweight Tyvek material. Grip-Seal® closure secures contents inside. Open End means the opening is on the smaller side of the envelope. Open Side means that the opening is on the longer side of the envelope - for an even larger opening.