When you exercise a lot, you should drink more than usual. The easiest way to do this is with a hydration system. That's why you can complete your Atrack with a professional hydration system, consisting of a specially shaped and designed 2-liter water bladder, a removable hose, a mouthpiece valve with protective cap, and a thermal-seal pocket that keeps the Fresh water even after hours. The drinking tube is simply threaded through the seal on the backpack; the waterproofing remains guaranteed.
OTHER PRACTICAL DETAILS:
+ BPA free
+ Easy to clean
+ Tasteless
+ Durable