Using the same unique high frequency welded construction and handy Fold Seal System as our "Overboard" bags, this lightweight laptop bag is suitable for quick submersion and will protect valuable contents from sand & dirt as well. Made of environmentally friendly TPU and featuring heavily padded internal walls, itÆs a tough cookie. Add to that a large internal zip pocket and a padded & adjustable shoulder strap and youÆre looking at the daddy of all waterproof messenger bags out there