Fanny pack is made of extremely durable polyester and has a buckle to quickly put it on or take it off. Adjustable strap fits up to a 44" waist. This is a modern fanny pack so the main pocket is designed to hold a smart phone, or carry a 20 oz. bottle of water. Second pocket is designed to hold car keys or other small accessories. Secret hidden pocket in the back holds vital items like a passport, credit cards or currency for travel. The secret pocket keeps those vital essentials hidden and against your person. 12”L x 5”W x 3”H