The Vortex Hydrator is great for mixing powdered drinks or staying hydrated on the go. The atmospheric assist valve allows for easy liquid flow while drinking with no "vacuum effect". The lid is treated with Agion to protect against mold, mildew and bacteria. The custom Vortex Agitator breaks up powder clumps and the reusable ice wand keep drinks chilled. Can be used as a water bottle, shaker cup or drink chiller. BPA free.