High Sierra Vapor Pack Two compartments with easy-access openings. Molded front compartment protects pack's contents. FLEX-USE sleeve holds most 17" (screen size) notebook computers (max. size 16" x 11" x 1.8") or a hydration reservoir (not included); convenient zipper position allows quick access to your computer. Open mesh shoulder strap media pocket offers even more storage. Versatile flip-down backpack strap pocket allows you to operate your MP3 player without removal.