Quality Park Tyvek Plain Expansion Envelopes - Expansion - 10 W x 13 L- 1 1by2 Gusset - 14 lb - Self-sealing - White Description: Regular-weight Expansion Envelopes offer superior protection for mailing bulky items that are not too heavy. They are ideal replacements for costly boxes or cartons. Design features an open-end style and convenient Flap-Stik closure. Much stronger and more secure than traditional paper envelopes these 14 lb. expansion envelopes made of DuPont Tyvek won t rip tear or puncture. They are water-resistant and moisture-resistant. They are easy to use. Simply peel and seal. Features: Product Dimensions: 10 W x 13 L- 1 1/2 Weight: 14 lbs Self-sealing. Tyvek Color: White Country of origin: US Brand Name: SURVIVOR Model No: 2088-QUAR4500