Review on 🥤 Sundesa BlenderBottle with BlenderBall (20oz/Black) - Pack of 2 - Ultimate Mixing Solution for Smooth Shakes and Protein Drinks by Rebecca Jones

Does what it should. Bought based on other reviews and unfortunately didn't use any other brands to compare but I would recommend these for use with whey/protein powder. The first time I used it it didn't leak at all. Good size, good value for 2 bottles. *Update* I've since added a 28oz bottle. I carry 28 ounces to work every day with an energy drink mix and 20 ounces in my protein powder gym bag. Nothing leaks, nothing is faulty, they work perfectly, they wash easily, I have nothing good to say about them. The 28-ounce bottle turned yellowish, but I've noticed the drink mix staining other cups as well, so it's not the mixer bottle that's the problem.