Took them on a 2 week trip to Europe. The large silicone glasses were great. They were the perfect size for what I needed and I had no issues with them leaking. I had problems with medium/smaller hard cans. You definitely can't handle air travel pressure drops and leak in your toiletry bag. I don't think I overfilled them and I was surprised considering they have a bit that goes over the top of the jar before the lid is screwed on. things you pack in carry-on luggage), but for anything in checked luggage on planes, I'd say smaller cans are an absolute no-go.
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