Vacuum Insulated Stainless Steel Water Bottle 64Oz (Cold for 48 Hrs/Hot for 24 Hrs) BPA Free Double Wall Travel Mug/Flask for Outdoor Sports Hiking, Cycling, Camping, Running. Superior Material: Made of 100% non-toxic BPA-free plastics & durable food-grade 18/8 stainless steel, protecting the water flask from oxidation and flavor transfer.