The optional mesh Utility Bag provides the perfect storage space for a few small medical items or other essentials. Attach simply by hooking clasps on the bag into rings located on the backside of the chair. The bag is just as easily detached and converted to a convenient tote for outings. One size available- Width: 13 in. (33cm), Height: 13.5 in (34.3cm). Depth: 4 in. (10.2cm) Weight Capacity: 20lbs (9.1kg). Fits all Convaid Push Chair models and sizes!