Here's what other sites are saying:
Strap the Geigerrig Insulated Tube Garage to any standard hydration pack to insulate and protect your drink tube and bite valve. Garage has an internal pocket for loading handwarmer packs to prevent bite-valve freezing during frigid conditions. 15L x 1W x 1H. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Hydration Packs.
Geigerrig Backpack Accessories Insulated Tube Garage 85212. Also contains an internal stall to load in a hand warmer to provide an internal heat source for helping keep your tube and especially your bite valve from freezing in cold temperatures.
Geigerrig Insulated Drink Tube
Geigerrig Nano Drink Tube
Geigerrig Filter Ready Drinking Tube
Yeti Rambler Tumbler Straw Lid
Guyot Designs SplashGuard
Nalgene Insulated Water Bottle Sleeve
$10 - $18