This is a solid shake mixer bottle, and I prefer VOLTRX to other brands. according to its description, the plastic used in its products is a good material that babies can use too, so it’s safe to use.
The shake bottle mixer itself is almost the same as the others, with a wide top and a slightly narrower bottom. However, they don’t leak and are easy to swirl. The caps are well put on. Time will tell, but if something goes wrong, I’ll bet it’s the caps that aren’t tightened. But so far so good, the protein shaker bottle has a small finger handle for easy carrying.