Review on 🌪️ Smartshake SLIM 17 oz Shaker Cup, Black - Perfect for Efficient Mixing and Portability! by Brockington Zuniga

Bought to mix protein powder with milk hoping the "mixer" would work better than the little springs or plastic balls that are most commonly used and it works. In fact, it works MUCH better. I switched to a blender because the blender balls weren't working well in several different mugs I had purchased. But this bottle leaves absolutely no grainy texture (protein powder oddly doesn't like being mixed with liquids, including milk, and needs to be mixed quite aggressively to get really smooth). All parts are quite solid, especially the top. But the threads holding the cup to the bottom are tiny and don't go all the way through. Also, the bottom cup is a bit flexible at the top where the threads are. It's holding up pretty well these days, but not much to compensate for normal wear and tear. I'll post an update if the threads below get muddled, but overall I'm almost jumping on and I'm happy with them. I've been washing my blender 2-3 times a day (plus a travel mug) for over a month now. Pretty good on this one. These are way better.