50% lighter & ten times stronger than paper envelopes these white mailing bags accept all types of self-seal stamps & labels & have an easy to write on surface. The thick polythene is also entirely opaque, meaning this mailing bag is perfect for concealing the contents of your posted items. These polythene mailing bags are closed with a self-seal adhesive strip so there is no need for tape or glue. Manufactured from 75 micron polythene, these polythene postal mailers are suitable for heavyweight items, catalogues, files, print-outs or textiles. These white mailing bags are also 100% waterproof, supple & tear proof. If you want to discuss your packaging requirements with one of our experts call 0800 542 44 28 today, & get next day delivery. Quantity Available in packs of 50 or 100. Please see our discounts for 3 or more packs if you want to order in bulk. Size & shape options These white plastic mailing bags with a write on panel measure from 240x 320mm & go up to 850x 700mm (internal opening x height). Materials These opaque mailing bags are made from 75 micron polythene. They are water resistant, tear proof & supple Delivery information Delivered sealed in cardboard boxes.