40L WaterproofHiking Anti-Theft Sling Bag Shoulder Chest Cross Body Backpack Lightweight Casual Daypack. The fashion version of the type concise but not simple, high-grade Canvas material, extraordinary quality. Exquisite design, generous, simple fashion. Breakthrough cumbersome, Handy convenient Anti-theft Design With durable metal zippers, it is safe for protecting your valuable items inside. No need to worry theft easily opening your backpack when you are travelling or lining up. EXTRA SAFE WITH USB PORT is It also has a USB charging port so you can easy and quick charge any of your devices so your gadgets will never run out of battery. You can easily and conveniently charge your phone, tablet and other devices without opening up the backpack.