I ordered the AP Economy rack about 6weeks ago & should be getting it this week (fingers crossed), it holds the Sterilite 32 qt or 15qt tubs, so I'll have the 32qt for most of my adults. For my two larger adults, that are 691 grams, I have two larger tubs (40qt, I think) that I will be using for for the larger ones.
I really like AP, but it takes sooo long to get them, that I may just break down & make my own, & in that case, I'll be making the 40qt tubs standard for the adults.