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)