The Women's Amasa 6 Hydration Backpack might be the smallest option in Gregory's mountain biking-specific Amasa collection, but it sure packs a punch when it comes to quick rides. It has the same three-liter hydration reservoir capacity that all the Amasa packs have, and there's enough room for a mini pump, multi-tool, and patch kit. The Shift RS suspension system wraps your shoulders and back in spacer mesh to keep cool air circulating through during those hot summer rides.