Large panel loading main compartment provides accessibility to inside contents Dual stretch mesh side pockets provide additional storage options The multi-function interior sleeve can be used for either a hydration reservoir or tablet Mesh-covered die-cut foam back panel provides both comfort and ventilation. Front zippered pocket with mesh organizer and key clip Total volume: 13L - Attaches to a variety of compatible Osprey Packs dimensions (approx) 18 x 9 x 9 inches in excellent condition with very minor signs of wear. see photos