Deluxe Tyvek Expansion Envelopes, Open-Side, 4" Capacity, #15 1/2, Square Flap, Self-Adhesive Closure, 12 x 16, White, 50/CT

Ideal for mailing bulky items and materials. Excellent alternative to heavy boxes and cartons. Superior water-, chemical-, moisture-, burst-, tear- and puncture-resistant protection. Open-Side (Horizontal Orientation)-Features a maximum capacity of 4". Seam Type: Weld; Flap Type: Square; Trade Size: #15 1/2; Security Tinted: No.