Poly Mailer 100 Mailing Bags Plastic Mail Envelope for Shipping 3 Mil Postal Bags (White, 10 x 13 inch) Lip Size: 1.5 +/- . 3-millimeter thickness (+/- 5%). Usable Dimensions: 10 x 13. Paper Liner: Clear with antistat. Adhesive: Synthetic rubber  Hotmelt,  minimum +/- 1/8.