A backpack built to keep your water cooler for longer Insulated reservoir is sweat proof to keep dry Neoprene reservoir sleeve is reflective to keep cold Airflow channel between pack and back lets sweat escape Molded padded back panel stays comfortable while you ride Adjustable shoulder, sternum, and hip straps secure fit Durable fabric is DWR coated to fight the elements Plug-N-Play connect system for easy disconnecting Used but inside is super clean inside.