A bin system includes a plurality of bins arranged in stacks, wherein each of the bins in a stack includes a first element which interlocks with a second element in a lower bin in a stack of bins. The interlock holds the upper bin in a defined position on the lower bin. The first element includes a projection and the second element includes a lateral recess in a side wall of the bin. The system further includes two cross beams for supporting the stacks of bins, wherein the first element of the lowermost bin of a stack of bins is received between the two cross beams. The first element may comprise at least one additional projection arranged to engage an inner side of the side wall for additional support. The interlock between the first and second elements provides a self stacking function in that the interlock retains the upper bin on the lower bin.