I used it once to store shampoo, conditioner, fluoride rinse, moisturizer etc on two 2.5 hour plane trips. Having trust issues, I unscrewed the lids tightly and put them in a ziplock freezer bag. Not a single leak in one flight. A small leak from the shampoo bottle on a flight. So not perfect, but significantly better than anything I've tried. I would buy them again.
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