Bought two sets and used 10 containers. I taped the tops in place to keep them from popping open during the 6 hour flight. I've found that the leakage depends on the viscosity of the product you put in. Thick liquids like hair conditioner didn't spill. Liquid liquids, such as mouthwash, leaked. Not from the top cap where I glued it, but around the base where it screws onto the bottle. Eight bottles with viscous liquids remained closed, two liquid bottles with liquid liquids spilled. plentiful. Lesson learned.
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