A device configured to be installed in a vehicle seat for estimating an occupant weight. The device includes a bladder and a pressure sensor. The bladder is configured to define a cavity characterized as having a center of gravity. The bladder is effective to retain a fluid and pressurize the fluid in response to an occupant weight upon the bladder. The bladder is also configured to define an opening to the cavity. The pressure sensor is coupled directly to the opening in a manner effective to seal the opening and locate the pressure sensor proximate to the center of gravity. The pressure sensor provides a pressure signal indicative of the occupant weight.