High Sierra Tangent 45 L Top-loading Internal Frame Backpack Stretched mesh back panel with mesh AIRFLOW system help keep your back cool and dry. 45 liter, top-loaded main compartment with gusseted drawstring closure and adjustable top lid. Front-load sleeping bag compartment with divider. Convenient alternative access zipper for the main compartment. Dual webbing daisy chain to attach extra gear. Adjustable side and bottom compression straps keep gear secure. Soft lashing hardware holds ice ax/hiking poles. Dual mesh side pockets hold 1000ml water bottles. Contoured backpack straps with adjustable load-lifters and VAPEL mesh padding. Adjustable sternum strap stabilizes pack. Internal hydration reservoir sleeve and dual exit ports for tube (reservoir not included). Tuck-away rain cover, stored in a bottom pocket, also protects the pack when checked for air travel.