Survivor® 10 x 13 x 1-1/2 DuPont Tyvek Expansion Mailers with Self-Seal Closure - Expansion - 10" Width x 13" Length - 1 1/2" Gusset - 14 lb - Self-sealing - White - Tyvek - 25 / Box

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.