I have ordered them to carry toiletries and essentials like shampoo, hair oil, body oil, beard oil when traveling and also because I don't like the standard travel items from local department stores. They are transparent, which is easy to do with airport controls. However, a pinch reacts with argan oil, Johnson's baby oil, and also my beard oil (it's a blend of Portland Oil Company oils). Well, first of all, oil/moisture seeps through the rubber, it's like fine dew. And secondly, the pumping effect stops after 2-3 days. So I opened it up, took out the eyedropper and used an ear tip to remove this gunk from the rubber clip. Worked for 2-3 days, same problem. Spent money elsewhere on slightly more expensive silicone tongs (which I did) and had no problems with them.
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