thermoflask double wall vacuum insulated stainless steel water bottle 2-pack, midnight/stone thermoflask keep your beverages cold all day without a cooler (or hot without a microwave!) our double-wall vacuum insulated stainless steel bottles prevent outside temperatures from affecting the inside beverage temperature so your drink stays just the way you like it – all day long. this convenient two pack features our insulated spout id and protective bumper for each bottle. great for everyday adventures or outdoor activities like hiking, camping, biking, sports, picnics, and more.