Constructed of strong molded PE with 600D polyester inlay, the Outback series provides heavy-duty protection without the weight. Unique to this series is the numerically coded key specific lock (not a generic key, but a numbered key). Pack lock receptacles are also on the case (pack locks not included). Dense interior foam cushions your equipment, and velcro tie down straps hold them in place. The ergonomic handle is extremely comfortable.