Finally a 16-ounce shaker bottle made by Bariatric Fusion. It is a perfect fit for those looking for a more convenient/smaller cup that only needs to hold a small volume of liquid or fit into a tighter spot. It also has a unique 3 piece design made of First Quality, High Density Polypropylene plastic. It also includes a durable polypropylene plastic cylindrical sleeve that produces a perfectly blended drink every time, a tight, snug, leak proof, triple thread, screw on flip-top cap with an easy-flow spout for easy drinking and the latest in plastic molding technology, that actually does not require a thermoplastic rubber seal to be leak proof. (It does not require an inferior foam core seal like most companies use that either falls out of the lid during cleaning or eventually breaks down and leaks!) Add one serving (one scoop) of your favorite Bariatric Fusion meal replacement and six to eight ounces of skim milk, soy milk, or water and shake for 30 seconds and you’ll be all ready for a smooth, great tasting, high protein, and low carb meal.