When all you want is water, the CamelBak Eco-Hydrobak minimalist bike pack has you covered - enough water for a 2-hour ride, and a safe zip pocket for keys and essentials that measures 6" by 4". The New Crux reservoir also offers 20% more water per sip for faster hydration in the saddle. This bag is made with waterless dyed lining, recycled poly airmesh back panel. Includes water reservoir with 1.5L capacity. Through a partnership with 1% For The Planet, one percent of sales of EcoSmart products will be donated to nonprofits dedicated to protecting the planet. Nylon / Recycled Poly Air Mesh. 4" x 8.5" x 13".