Designed with biking in mind the Racing Red Camelbak Classic Hydration Pack with 2.1L Reservoir is well-suited to most outdoor activities. Housed in a 210 denier nylon pack, the BPA/BPS-free Antidote hydration reservoir features baffling to help minimize sloshing as you ride or run. The PureFlow tube is outfitted with Camelbak's Big Bite valve for efficient water delivery. The low profile design also minimizes sway, and the air mesh harness with sternum strap helps keep it tight while remaining comfortable. To help keep you cool, that same mesh is used in the back panel. Reflective accents help ensure you are visible to motorists, cyclists and other runners.