Top Power 8016 Ultralight and Ultra-versatile Packable Durable Travel Backpack/Waistpack/Shoulder bag -- 100% Satisfaction Guarantee-Lifetime Warranty Converts and expands from waistpack to backpack; top compartment expansion offers an incredible 270% more capacity when in the backpack configuration. Adjustable waistpack and moisture-wicking Air Mesh backpack straps for comfort. Zip-away internal divider for increased organization of contents. Two side compression straps.Two side bottle holders. Material:Water-resistant Nylon Fabric.Unfold: 17.7x11.5x7.8 inches, Fold: 11x7.4x2.7 inches. Product Weight:1.1 pounds