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Title: These are worthless pieces of junk
Review: I bought 4 of these. Guess what???? The tops are not interchangeable among the bottoms. God help you if you decide to mix a few drinks and do not keep the right tops associated with the right bottoms. The tops are either too tight (in which case you cannot make them fit) or too loose (in which case they leak when shaking). If you buy one, you are probably OK. But if you buy more than one you will regret it. Right now we have one that we cannot take apart. So that leaves us three. And, of course, another one is too loose (it being the one that was mixed up with the now-stuck-forever one). Total POS's
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