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The clear plastic makes it so easy to see what's inside without opening everything, and I haven't had any staining from tomato sauce yet. The little vents under the lids are handy for microwaving leftovers right in the container.

The latching lids actually seal — I turned a container of soup sideways in my lunch bag and nothing leaked. Stacking them in the pantry freed up a whole shelf, and the vents make reheating leftovers easy.

Bought these mainly for leftover soup and they haven't leaked in my work bag once, the latches really clamp down. Only thing is the lids take a bit of press to snap shut, so not something I'd hand to my kid. Stacking them saves a ton of pantry space though.