The CamelBak Unbottle is a versatile insulated reservoir sleeve that adds 3 hours of hydration to any pack. Designed to carry water. Includes new 100 oz. 3 L Antidote Reservoir with Quick Link System. Quick Link system: reservoir can be disconnected from tube without leaking for easy filling. Attachment points secure and stabilize the hydration system to your pack. External fill and refill without removing your reservoir. Sleeve made from 770D Diamond Clarus and 420D nylon with a DWR durable water repellent finish. Antidote Reservoir features: BPA free, Quick Link System, quick seal cap, lightweight fill port, low profile design for unmatched stability, Big Bite valve, HydroGuard technology, PureFlow tube, easy to clean wide mouth opening, folding arms lock out for faster drying of reservoir. Pack weight: 4.5 oz. 130 g.