Shaker Bottle for Protein Mixes Pre Workout Shaker Bottles with A Small Stainless Blender Ball and Grip, BPA Free5936 Shaker Bottle for Protein Mixes Pre Workout Shaker Bottles with A Small Stainless Blender Ball and Grip, BPA Free Description: If filled with water. Shaker bottle's cup for mixing protein shakes, smoothies, and supplements. Leak Proof: Screw on the lid to form a leak proof seal and snap on the flap to keep the contents secure; ring at the top for easy carrying or tying a key. Wide Bottle Opening: makes it easy to add the mixture and to clean it