OD Green Insulated Drink Tube Hose Cover | Gearhandle.com
Camelbak Water Bladder - Insulator Sleeve - Insulation for Hydration Backpack | eBay
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