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Rating: - The cover comes off too easily
This product could have been better if the flip-cover didn't break so easily. Even when it wasn't "broken" the annoying flip-cover kept on coming off too easily. I personally did not like this product because of that. If they make a better cover it would have worked great.

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Rating: - Ultimate (?) Shaker Bottle
I don't know about being the ULTIMATE, but it's a good shaker. It does what it's supposed to do, but it doesn't break up the powder completely. It does, however, break it up enough to make it drinkable. The cap pops off a lot, but all in all, I'd still buy this item again.

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Rating: - The MOST AMAZING Shaker - seals awesome - travels well. The best one I have ever used. Easy to drink out of. BUY IT!!!
I have used several shakers in my life but I am in love with this one. The material is great and easy to clean. The MOST AMAZING Shaker - seals awesome - travels well. The best one I have ever used. Easy to drink out of and the grates inside really break up the powder or whatever you are using in it. BUY IT!!!

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Rating: - This is the last shaker you'll ever need !
I bought several of these shakers. One for myself and several for friends. Everyone agrees, these are leak proof and do a good job of breaking up whey, creatine or whatever. Provided your not a moron and use too little liquid or don't close it tightly enough. I read the previous review. Sealer ring? Don't know what she's talking about. There is no sealer ring. Seems like it would get in the "whey" of a good seal. Threads are large and snap top snaps tight. Little wagon wheel with tiny squares help break up powders. Little word of advice with any shaker. . . Pour liquid first then add powder. Swirl powder a few times to get a little wet, THEN, shake away. . .

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Rating: - Love this shaker!
I've had one for the past year and it's great! One word of caution: keep up with the sealer ring or you'll spring a leak. I had a friend lose hers and she wound up wearing her shake. :)

Additional comment: The sealer ring (or gasket) is easy to overlook, thus you may miss it... until, of course, it's gone. It's a thin rubber ring that runs around the lid's interior rim and is pictured on the manufacturer's website here at ultimateshaker.com/images/cap-gasket-small.jpg.