I have LOADS of tupperware now as I've been a demonstrator for the last 8 months I am finishing up because, well... I have everything I need now! LOL!
I think the only thing I don't use regularly are the salad bowls. But I use them if we go on a picnic or if I'm bringing salad to a shared lunch with friends. I also have a stackable picnic set that I really like (got free) but don't think will ever use. I have excess stuff that I'm going to sell at a discount because they were in my kit but I already have enough of them.