The Lithium 15L Daypack is a lightweight, minimalist approach to a hiking backpack with everything we speed-hikers need and nothing that we don't. The 15-liter capacity is ideal for an added layer and a couple on-trail snacks, and a separate hydration sleeve keeps our water secured the whole way. This pack features a hip belt with only one pocket, and the whole belt detaches when we don't need the extra storage space or support.