Even those shorter cycling adventures require a constant supply of fresh water to maintain hydration and improve performance. The serious cyclist understands this and seeks out a minimalist hydration backpack that is lightweight and comfortable yet provides enough space for essentials. For those in search of a lightweight backpack with an easy to use hydration supply, CamelBak offers the perfect solution. The CamelBak HydroBak is the go-to hydration system for cyclists. Its lightweight design allows you to pack lighter, ride faster, and maintain hydration for two hours. The HydroBak uses our Crux reservoir that supplies 50 ounces, or roughly two large bottles' worth, of water. The revolutionary design of this hydration backpack delivers 20% more water per sip and features an ergonomic handle that improves refilling. It's a men's backpack that features a secure zippered pocket that's just big enough for storing your essentials like car keys, ID, and other vital items. It also features a lightweight and ventilated mesh harness and breathable air mesh back panel to ensure a comfortable fit while you ride. Our Got Your Bak Lifetime Guarantee covers all reservoirs, backpacks, bottles, and accessories from manufacturing defects in materials and workmanship for the lifetime of the product. The CamelBak HydroBak hydration backpack only weighs 5 ounces and measures 12.6 x 8.5 x 3.9 inches.