for me it is important in the first place that as a shaker is easy to clean, which is the case in this model. no grooves or deep edges, the opening of the mouth is large enough to also to clean this, the spiral can squeeze so you can clean them perfectly. in terms of size ranges of this for me just like that. I'm often times a shake with fat quark plus Serious Mass Weight Gainer because the thing is ever quite full. keeps super tight, it gets hard enough on when you screwed him even tighter.
