With double-walled construction to keep water cold twice as long as other bottles, the insulated CamelBak Podium Chill is the best-of-the-best for delivering cold, consistent cycling hydration. Features like optimized cage fit and improved cleanability continue to make this bottle a favorite among professionals and recreational users alike. BPA free. 21 oz. Trutaste with Hydroguard- bottle contains and additive (Hydrogaurd) to inhibit microbial growth (does not protect the user from disease-causing organisms) EC 528/2012: supported in the review program of active biocidal substances. Active ingredient: silver sodium hydrogen zirconium phosphate. CamelBak.com/hydrogaurd.