Thule's Vital 8L Hydration Pack is a saving grace when you suffer a ride-stopping flat, become suddenly parched after a long climb, or require an extra layer to fend off the cold. This mid-sized hydration pack includes a 2. 5-liter HydraPak reservoir, allowing you to embark on extended rides without requiring a top off, especially when there's no readily available water. One of its best features is the hands-free ReTrakt hose, which conveniently snaps back into place after you've lifted it for a sip while riding. Besides its hydration capabilities, you'll enjoy an expandable front pocket for stuffing an extra layer or compact jacket on epic rides across thousands of vertical feet. Inside the pack, there's a plethora of organizational pockets for carrying a smartphone, sunglasses, repair essentials, and pump. And because many hydration packs suffer from poor ventilation, the back panel and shoulder straps feature an airy-cool, well-ventilated design.