a device for inflating and deflating the shoulder strap of a satchel that includes an inflatable cushion located inside the strap that is connected to an inflation / deflation mechanism formed of a resilient deformable material including a bulb - like pump and a deformable valve housing coupled to the pump by a connecting line . the valve housing contains a ball valve that automatically opens when the pump is activated to inflate the cushion and closes to prevent air from escaping from the cushion when the pump is deactivated . depressing the valve housing displaces the ball valve allowing air to escape from the cushion . the inflation / deflation mechanism is integrally mounted inside a pad that is attachable to a satchel by a fixed strap and an adjustable strap .