First question, are you going to be using the lids? If so I would say go with Rubbermaid "Snap Toppers." The lids are nice and tight, and are a little thinker in material then Sterlite. I also like the latch used to lock the lid on. If you are not going with lids, I'd still go with Rubbermaid. Sterlite and other cheap brands tend to be, well, cheap. Just my opinion though, I'm sure someone else can recommend something else.
Joe
>>I will be building a rack soon. I will be getting some larger tubs from reptiletubs since I can't find that size in the stores. I want to include some medium tubs, which I can get from the store. I just want to see if anybody has had any problems with a particular type of container like rubbermaid or sterelite (warping, weak containers, etc.) Thanks.