The CamelBak Unbottle is a versatile insulated reservoir sleeve that adds 2 hours of hydration to any pack. Includes NEW 70 oz 2 L Antidote Reservoir with Quick Link System. Quick Link system lets you remove the move from the reservoir without spilling a drop. Quick snap cap that tightens in just a quarter turn. The large porthole makes accessing and cleaning your reservoir easier than ever. Low profile fit for unmatched stability. Air light fillport cuts weight. Made of super strong polyurethane. Additional Features: External fill, Attachment points.