Just out of curiosity, why does everyone build the racks for tubs with no lids? I use 32 qt tubs with locking lids, and just made the space between the shelves 7" apart, that way IF they stop making the particular tub that I am using, there are plenty more that are out there that fit into the 7" slot, plus, I can use smaller tubs of different heights in the same rack for babies. The locking lids also do not allow condensation to collect directly on the melamine, which will eventually degrade it.