Lots of storage. expandable. About this item COMFORTABLE DESIGN - Its sturdy straps and heavily padded, water-repellent ergonomic nylon design, conforms to your back. EXPANDABLE - Expands to carry-on luggage size to hold your items safely and securely for convenient travel. AMPLE STORAGE - Interior includes 1 Large Mesh Pocket and 2 Medium Zipper Pockets, and exterior has 2 Front Zippered Pockets, 2 Expandable Side Zippers TECH FRIENDLY - Includes built in laptop and tablet compartments, with USB and charging cable port for your technology. (Battery not Included) DIMENSIONS - Expanded; 20” x 13” x 12”, Collapsed; 20” x 13” x 5”