Bulk Tyvek Envelopes Flat with Self Seal ClosureWhite Tyvek envelopes hold more than twice the contents of standard paper envelopes. These come with an easy to use self seal closure. The seal flap works without any moisture. This soft packaging solution offers strength, protection, and postage savings. Tyvek Envelopes weigh roughly half as much as stock white envelopes. eCRATER sellers love our soft packaging solutions.5 1/2 X 7 1/2 Tyvek Envelope SpecificationsWeight: 14 lb.Closure: Self seal Zip StickPackaging: 500per cartonSize: 5 1/2 X 7 1/2Wholesale Price: $169.50 (500)Discount: Multiple carton discounts......Make an offer now!Additional Services: We can custom print all stock items with up to 4 colors.ENVELOPESPOTNeed a different size or substrate? Check out my other items!Tyvek Envelopes distinguish your company as a first class organization.