hydro Flask cold or hotter longer this is a black hydro Flask 24 oz wide mouth with flex straw cap it says hot for 12 hours dishwasher safe it's temperature shield double walled vacuum insulated BPA free stainless steel leak proof cold for 24 hours this is a brand that we all know and love this is the 24 oz hydro Flask wide mouth with flex straw cap. brand new still has tags on it never used. grab these while you can they will not last.