The CamelBak Antidote Reservoir 100 oz Long serves as a reliable water supply in combat environments and fast-paced missions. Constructed from thermoplastic polyurethane film, this reservoir holds up to 100 ounces of water. The QL HydroLock drink tube has an insulated cover that guards against abrasion and harmful UV rays. It also allows you to attach CPC accessories with ease, including the USMC standard filter. The fillport is made with the largest opening in the industry and features air-light quarter turn opening and closing for a secure seal that cannot be over-tightened. With a no-spill valve and one-handed on/off water flow, this reservoir is expertly made and easy to use.