Stanley classic vaccum water bottle is tough and innovative. 18/8 stainless steel won't rust and naturally BPA-free. Vacuum insulation keeps drinks iced 36 hours, cold 7 hours, and hot 6 hours. Two-Stage opening makes it easy to drink and clean, as well as ice compatible. This water bottle is leak proof and fully packable. Lids are attached with lanyards so the lid is never far away. Dishwasher safe.