The CamelBak Hydrobak is perfect for minimalist cyclers looking for the bare essentials to keep them covered. This hydration pack has carries enough water to keep you hydrated for up to two hours of strenuous activity . The outside features a mesh backpanel that helps you stay cool and reflective highlights to keep you visible in low-light conditions. On the inside you'll find CamelBak's newest reservoir system- the Crux, which was designed to deliver 20% more water per sip. Grab the Hydrobak and start pumping out the miles while staying hydrated.