This 16oz BPA-Free Clear Plastic shaker bottle is durable and is easy to carry. It is perfect to take to the gym for pre or post work out shakes. Also works well with all meal replacement shakes. The Silicone spiked mixer works great with the shaker cup to evenly blend all supplement powders to help reduce clumps and buildup found in most situations with competitors shake mixers. This is the perfect work out cup for any exercise enthusiast, and For Your Water Bottles guarantees that your favorite liquid based work out companion is safe from any contaminates.