Our largest and most advanced multi-day assault pack positions the water weight around your hips for a lower and more stable center of gravity. RESERVOIR FEATURES: 100 oz Mil Spec Antidote® Lumbar Reservoir repositions water weight low and on your hips for a lower and more stable center of gravity with easy-to-fill and clean wide-mouth opening, rugged and durable material, leak-proof ¼-turn cap, insulated PureFlow™ tube, patented Big Bite™ Valve, Quick Link™ Exit Port and Drink Port, QL HydroLock™ one-handed flow control. KEY PACK FEATURES: Mil Spec Antidote® 3L Lumbar Reservoir stabilizes the water weight on your hips; Composite MOLLE webbing on shoulder harness and internal panel allows additional gear carry; Internal composite MOLLE panel allows you to customize the location of essential gear/pouches; Contoured back panel and fully-adjustable padded waist belt; Full clamshell opening for easy access to main compartment; Low-profile, padded side pockets protect critical gear; Lower access zipper allows you to quickly stash or grab an item from the main compartment; Deployable internal panel enables the creation of upper/lower compartments in main cargo