Mail lite protective postal bags are lined with Aircap bubble material with a special air retention barrier to seal every bubble against air loss for high performance cushioning. Mail lite are easy to write on, with excellent label adhesion. All Mail lite bags have a self seal strip on the lip, after filling remove the release tape and fold over the flap to make a permanent seal.Each envelope has a unique tear strip for quick and easy opening by the recipient. Mail Lite Bag - H/5 - 255 x 355mm (Books)