I bought these to take on an international trip. Total flight time 11+ hours. I reached my final destination and saw that the bottles hadn't spilled. I was concerned they are flip tops but they work great! The holes are wide so they are easy to fill. When you squeeze the bottle, shampoo or whatever comes out, the bottle collapses and creates suction to prevent leakage. I've only used them for shampoo and conditioner so I'm not sure how they would work with oils or anything more liquid. But they fit my requirements perfectly!
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