How much water is left in your pack? CamelBak's Antidote Insulated Tube With Flow Meter answers that very question by measuring your fluid intake and expenditure. This useful gauge integrates into your reservoir's hose, is small enough to stay out of the way, and large enough to be easily read at a quick glance. Now you'll know how much liquid remains, helping you to better plan your rides. Another handy setting is the hydration goal feature, which is indispensable for maintaining a consistent fluid intake and riding your strongest. Plus, the insulated tube keeps the heat and cold out, and it conveniently clicks into any CamelBak bladder with the Quick Link system.