Deluxe Tyvek Expansion Envelopes, Open-end, 1.5" Capacity, #13 1/2, Square Flap, Self-adhesive Closure, 10 X 13, White,100/bx

Ideal for mailing bulky items and materials. Excellent alternative to heavy boxes and cartons. Superior water-, chemical-, moisture-, burst-, tear- and puncture-resistant protection.