Big enough for all-day hydration and a wide mouth for easy fill. The 18/8 pro-grade stainless steel ensures pure taste, no flavor transfer, and durable construction. BPA-Free and Phthalate-FreeTempShield™. Color Last™ powder coat is dishwasher safe for even more convenience and it stays colorful for every adventure. Fits most backcountry hydration filters. Cold stays ice cold for 24 hours, and hot stays wickedly hot for 12.