Quality Park Tyvek Heavyweight Expansion Envelopes - Expansion - 10" Width x 13" Length - 2" Gusset - 18 lb - Self-sealing - Tyvek - 100 / Carton - White

Expansion Envelopes with heavyweight Tyvek offer superior protection for mailing bulky items that are not too heavy. They are ideal replacements for costly boxes or cartons. Envelopes feature open-side style and convenient Flap-Stik closure. Envelopes made with DuPont Tyvek won't rip, tear or puncture. They are much stronger and more secure than traditional paper envelopes. These 18 lb. envelopes are water-resistant and moisture-resistant. They are easy to use. Simply peel and seal.