I've been to more Tupperware parties than I can count! The plastic bowls with lids and such didn't work well... i have an adverse reaction to moldy stuff and switched (before there were the disposable containers) to margarine tubs. I've often wondered how many half full containers of margarine I've tossed because I was scared to look inside...
About 20-30 years ago I had a friend who was selling Tupperware and I still have and use the largish beige stackable (with a strainer or steamer insert) meant for microwaves set, sort of a melamime texture. I actually have two sets and love them and use them pretty much daily. There is also a softer plastic rectangular set of a base, strainer/steamer/lid. We had two sort of rose-brown shade sets and they were pretty thrashed and didn't make the move. I did however, find a harvest yellow set pretty much unused at the Goodwill and that one did make the move. I use it at least once a week as well...