Multiple sizes Poly Mailers shipping envelope self-sealing plastic pouch size:6×9 7.5×10.5 8×12 9×12 10x1312x15.5 12.5×17 14.5×19 19×24 24×24 24×36 They are made of polyethylene plastic and have a adhesive seal to securely close the envelope. Heavy duty with very high resistance to dirt, water, pressure, punctures and tears, different sizes provide protection in all weather and transport conditions allowing the use of a wide variety of items Shipping approval via major carriers such as UPS, FedEx, USPS, etc. They are promoted as an economical shipping option compared to boxes/tubes for non-fragile items. Shipping: Item will be shipped within 1 business day after clear payment received. We ship from the US.We also provide tracking number for every order so you don’t worry about where it is. Shipping is always free to the lower 48 states. Please make sure your ship-to address is correct. We do not ship to PO or APO boxes. Please inquire about shipping to Hawaii, Puerto Rico, Alaska, VI as we do not generally ship items to these locations. There may be an extra shipping charge. RETURNS: We offer free returns with a 30 day return policy.