This ultra-convenient daypack is ready for any outdoor adventure and comes with a three-liter reservoir for all-day hydration. Its versatile design excels on the trail, but its comfortable shape feels great while we ride and run as well. We love that this hydration pack is spacious enough to bring on a day hike and lightweight enough to wear comfortably for the entire trek. With strong, nylon ripstop and a water-repelling rain cover, we're assured that our gear is safe in a variety of conditions.