Classic Stanley Thermos

If you don't own one....you should. 

Keeping coffee hot since 1913, the classic Stanley thermos ($48) features rustproof stainless steel construction with iconic green casing that stays cool to the touch. Double wall vacuum insulation means no leaks, plus hot liquids stay hot and cold liquids stay cold for a full 24 hours. Finished with a cap that doubles as a cup and a rugged carry handle. BPA-free. Retro. Dependable. Perfect for coffee, soup, hot cocoa, green tea ...etc.

Stanley also makes an 8oz flask ($28). Love it. 

Buy them online at Urban Outfitters.