A favorite for moving fast and light in the backcountry or on the trail. This lightweight Fastpack 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. Source: Imported Features Large front storage for water, phone, maps, glasses, or food 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 Water bottles not included Materials 100% polyester Specs Volume: 1427.95 in3 / 23.4L Height: 18.5" / 47.0 cm Width: 11.0" / 27.9 cm Length: 7.0" / 17.8 cm Weight: 1.3 lbs. / 0.59 kg Sizing at Chest: SM/MD: 26 - 39 in / 66 - 99 cm MD/LG: 36 - 48 in / 91.5 - 122 cm Maximum Torso Length Sizing (measure at the high point at top of shoulder down to the natural waist): SM/MD: 17 in / 43 cm MD/LG: 18.5 in / 47 cm