Nice Concept But Failed
I love the little metal ball that collaspes flat when you push down on it. But used it for a powered protein drink and after repeated, repeated shakings I still tasted clumps of powder as I drank it. I'll use my electrical one cup drink device from now on. Maybe it would work better on lighter powders like dry milk but I don't know. Note, it is larger than a regular cup size as well. Cap seals well, even when you lightly hold the tab to ensure it doesn't spring open (which it didn't) to shake.
Rating: 1 stars