I'm having a tough time finding a leak proof container for taking soups to work in my lunch tote that won't leave the rest of my lunch soggy. Last two containers I tried were Rubbermaid. One was a snap lid bowl that the center of the lid completely separated from the rim in the microwave and fell into my soup. Nice. The other was a rectangular 3.2 cup Brilliance "guaranteed leak proof" container that was only leak proof for the first few times through the nuker. Any suggestions for a bowl-shaped container with a truly secure lid that will also hold up to the heat from microwaving? The 24+ fl. oz. size is what works best for me. Plastic is okay, but glass or ceramic would be nice. Seems like glass would be harder to seal, though. Maybe something with a screw top?