Material: sling backpack is made of sturdy and durable polyester,waterproof. Size: Not Oversized.7*3.2*12.2 inch(L*W*H).With a long crossbody adjustable strap,smooth zipper. Chest bag for men external USB Interface: You can easily and conveniently charge your phone, tablet and other devices without opening up the backpack. Designed for comfort: can be used both as chest pack and shoulder bag, messenger bag, travel bag; Satchel strap is adjustable and can be left or right shoulder, Fit both regular and plus-size person Structure: three zippered main pockets and a mesh pocket on side. Roomy compartment to organize your cellphone, tablet, wallet, keys, ID card, credit card, small snacks.