by 
Gear up for the outdoors with the the E-Race Boa by The North Face ($100). This hydration pack features an anti-slosh dial that compresses the pack around the reservoir of 1.5 liters of water and allows you to tap all of the pack’s content until empty. The E-Race Boa includes a magnetic bite valve that keeps the hose in place and a unique E-VAP harness and back panel made with a smooth and skin-friendly mesh to minimizes abrasion and provide a more comfortable fit. [source]