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; 100% polyester