2 of 2 people found the following review helpful
This review is from: Blender Bottle Classic 28oz Pink Transparent (820ml) - Shaker Cup / Water Bottle (Kitchen & Home)
I've used a few other bottles for protein powder drinks. Online the others, this one doesn't have the tiny cracks or grooves in the cup where powder can settle.
The cap does have a groove, but it's easy enough to clean out with a toothpick or butter knife. The blender ball does help mix powders, but as a warning: it's a little loud.