A favorite for moving fast and light in the backcountry or on the trail. The lightweight, women's-specific fit FastpackHer 20 allows you to move fast in the backcountry with a durable design that checks all the feature boxes. True to our roots, it uniquely fits like a vest with water bottles up front, but distributes weight like a pack. We gave it an upgrade with Infiknit™ and FastFlow technology to increase the backpanel's breathability and moisture wicking. This do-it-all pack also has plenty of dedicated external storage, a roll-top opening and a full-side external zipper for easy access to anything inside. Specifications Large front storage for water, phone, maps, glasses, or food Two large side pockets for larger water vessels Unique zip-down main compartment for total access to gear Roll-top closure expands or compresses to secure varying capacities Large external stretch mesh pockets for quick access Sliding rail sternum straps Height adjustable T-hook harness for weight distribution Easy access pocket with keyfob MonoRip Mesh is very strong, but extremely breathable. Daisy chains for securing extra gear Size Chart Sizing at Bottom Ribs: XS/SM: 22 - 47 in / 55 - 120 cm MD/LG: 24 - 50 in / 60 - 125 cm