Years ago I bought a set of tupperare storage bowl - they allow for reheating in the microwave (with a snap vent on each lid). The top Have NEVER fit without excuciating struggles and incredible frustation. I refuse to buy tupperware again. Has enyone encountered this and found a solution?? (Hty have been in the back of ny cupbard, but I pulled them out agaih today to try again - again I am defeated and frustrated!