I used oatmeal or scrambled eggs heat, so I can not comment on the seal, but I doubt that there is a nice soup. Protect the hot morning meal for a few hours, between what is in the house in the morning and the food in the workplace. You can also keep food warm longer, have not tried. The quality feels good, and the number of applications to date, and the longevity of the suspects are higher than costs in the long run.

Thermos Element 5 16-Ounce Leak-Proof Food Jar Features

16-ounce stainless steel food jar with integrated carry loop and carabiner--great for backpacking
TherMax double wall vacuum insulation locks in temperature to preserve flavor and freshness
Unbreakable, dent-resistant 18/8 stainless steel; leak-proof lid lets you bring hot or cold foods anywhere
Rubberized, shock absorbing base with a wide stance for stable footing
Hand wash only