Lumps in the protein shake. Like eating dirt. If you’re not down with that, get yourself a ShakeSphere Tumbler. Unlike other protein shakers, this award-winning bottle doesn’t use a mixing ball or mesh grid to mix. Instead, the patented capsule shape does the mixing & nothing can get stuck in corners. Smoother shakes & smoothies & no lumps. It’s made from rugged, BPA-free Tritan plastic & features a leak-proof slide cap. 24-ounces.