Nalgene 12 Oz Flask BPA free, made using the finest plastics and metals Great for use in both outdoor and indoor activities Great look and innovative carrying solutions for your liquids Nalgene ingenuity makes it leak proof. Bulk-proof design keeps it neatly tucked away when not in use. Hydration at its hippest! Made of Polyethylene Terephthalate (PET), odor and stain resistant with glass-like clarity.