There is disclosed a storage bin (11) transportable by a wheelbarrow of the kind comprised of a load receptacle, a front support wheel and a pair of elongate handles spaced one to either side of the load receptacle and projecting rearwardly from the load receptacle, said storage bin (11) having front (18) and rear (19) walls connected by side walls (20) and a floor (21) defining a storage space (22), the side walls (20) being stepped so as to have outwardly extending downwardly facing shoulders (23) extending from front to rear of the bin such that the bin can be mounted on the handles of a wheelbarrow of the said kind so as to straddle the handles with the shoulders of its side walls resting on the handles and the parts (24) of the side walls below the shoulders projecting downwardly between the handles.