Booster seat bag with rigid inner structure can be fitted onto an adults chair and quickly and safely fastened to the seat and the backrest padded upholstery with outer pockets so all the contents can be easily accessed features suitable from birth to 3 years practical bag booster seat with a rigid inner structure to protect the contents quickly and safely fastens onto an adults chair by the seat and the backrest padded and hard wearing upholstery that can be washed and taken on journey