VeloTubes Purist (Specialized) 23 Oz. Insulated Sport Water Bottle - BPA Free - 20% Colder Than Other Insulated Bottles 23 oz. insulated bottle - BPA Free! Pure Taste Technology through the purist infusion shielding process MoFlo cap for maximum water flow Easy to squeeze polymer bottle (other top brands are stiff) Fits in a bike water bottle cage or HydraQuiver