To get straight to the point, the suction cup trick is useless. It won't work anywhere, and I don't even know why you need it. However, I like the color coding and the ability to change the type of substance it contains. (Although, now that I say it, flowers are kind of over the top.) Anyhow, they seem to be of pretty decent quality, and the lids fit snugly. I have yet to take them on a trip but I did a 2 day water test and they didn't leak when the book was on them.
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