No leak problems but have not traveled or attempted to ship. The atomizer is the best of the 5 I've tried so far. The cloud of mist is bigger and thinner than the other 4. You can't use high concentrations of really resinous oils like myrrh or pure oils like coconut with an atomizer without getting wisps instead of mist as some people comment on these things. I keep my mixes below 20% oil and alcohol and have had no problems.
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