Favorite of the endurance racing community. The best manifestation of the LOW RIDER SYSTEM to date! 600 cubic inches total volume, 16 oz weight (Bladder not included with pack) HAMMER GEL FLASK AND PACKET INCLUDED! 1. Mesh shoulderstraps are completely breathable and lightweight. Left strap features a quickdrop mesh pocket for energy bars, phones, or tools.2. Features the Lowrider harness system