High Sierra Monsoon Pack Multiple large compartments open wide for easy-access. FLEX-USE sleeve holds most 17" (screen size) notebook computers (max. size 16" x 11" x 1.625") or a hydration reservoir (not included). Versatile flip-down backpack strap pocket allows you to operate your MP3 player without removal. Zippered side pockets hold a water bottle or other gear, zippered top accessory pocket holds sunglasses. Open mesh shoulder strap media pocket offers even more storage.