The Hydra LG4 provides you with enough storage to carry essential items on the running leg of your race. An insulated section allows you to safely store a water bottle, with easy access when you need to re-hydrate. The ergonomically shaped back section employs mesh to enhance breathe ability and comfort, while an inner hook provides somewhere to safely place your keys during transport. The Hydra LG4 is supplied with a 600 ml water bottle.