A multipurpose traveling bag for carrying personal items and/or infant care supplies comprising a primary bag section and a removable auxiliary bag section is disclosed. The primary bag section can be hand carried or worn as a backpack with or without the removable auxiliary bag section. The primary bag section has a fold down seat that can be used as a booster seat by infants in a first or infant care bag embodiment of the present invention and can be used as a seat for adults in a second or backpack embodiment of the present invention. In a third embodiment, the present invention is adapted to be mounted upon a bicycle to additionally provide an infant bicycle seat. In all three embodiments a cooler compartment provides for the storage of perishable food items. The multipurpose traveling bag is constructed of a vinyl or nylon covered extruded plastic framework or can be fabricated from vacuum formed plastic. It is therefore lightweight and easy to clean.