Zipper closure. Made of lightweight Nylon, waterproof and sturdy. Ergonomic & breathable straps to ease pressure on the shoulders. Dimension: 9 x 12 x 5 inches (L*H*W); Cute and totally handy bag but big enough main compartment fits a tablet/ ipad air/ mini/ kindle, a small umbrella, sunglasses, a water bottle, makeups, snacks and other daily essentials. The adjustable straps at the back can be combined into 1 to carry on your shoulder or split into 2 to fit on your back. You also get a handle on top for carrying or placing it on a hook. This small backpack has 5 inner pockets (including 1 mesh zipper pocket) and 2 outer zipper pocket on the front & back to hold your phone or keys for easy access. Ideal for a trip, school, shopping, hiking, biking, or casual outings. Carry as a cross-body bag, shoulder bag, backpack for hands-free. Perfect gift choice.