GO IN STYLE and ADD Color with Insulation to your Hydration Pack Drink TUBE!!! Match your drink tube with your Camelbak or Hydration Pack. Don't let the sun rays heat up your drink tube. Protect against those weather conditions.. cold or hot weather... Protect, Conceal, and Insulate your Camelbak or Hydration Pack Drink tube with this 36" tube cover. These nylon braided tube covers will fit up to a 1/2" bare drink tube.