They are very stable, the lids open without much effort and close well. The cups don't leak (one of these sat on my desk for 2 days and didn't even get soft) but liquids will leak if you hold them upside down because the lids have holes for steam to escape. avoid, but they work great in the microwave. I really like it when they make their own eggshells. I can make some with chopped veggies, cheese, and sausage crumbles in a bowl and store in the fridge or freezer. If I want a quick breakfast, I just crack an egg and pop it in the microwave. They work great when I'm staying at a hotel or camping in my RV. They also do well in things like macaroni and cheese or casseroles, and they do well in soups as long as you keep them upright. If you're worried about leaks from the holes in the lid, you can wrap the mug in plastic wrap before putting the lid on and they'll make a good seal. Just remove the plastic in front of the microwave. I will definitely buy these again.
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