The Lifestyle Rhythm P2 Backpack allows you to enjoy being able to use the backpack all day everyday, while you do household chores, run errands, visit friends or family, or while exercising. The backpack is designed to give you a more efficient way to enjoy hands-free operation, allowing you to use both of your arms with ease. Instead of draping your P2 over one shoulder, the backpack allows you perfect equilibrium and balance while you're carrying your portable oxygen concentrator.