Amazon.com : CamelBak - Mil Spec Crux Black Replacement Tube (2039001000), One Size, Standard : Sports & Outdoors
Amazon.com : Hydration Tube Covers Bladder Insulators are Compatible with Camelbak Reservoir Water Bladder. Will fit MIL Spec Antidote and Crux : Outdoor Backpack Reservoirs : Sports & Outdoors