I've been using these for a few months now and they are not airtight. I'm sure they probably work for thicker liquids like lotion but I bought them to store liquids like contact solution. Every time I traveled with them (which is quite often), they leaked a little. Luckily I keep them in an airtight holdall, but when I unpack the holdall everything in the bag is slightly damp and I have to wipe everything down. For now I just throw them away and use a different brand. I hate that I spent my money on this!
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