This spacious flask is virtually unbreakable, so you can take it with you wherever you’re going. The stainless steel finish is smart and sophisticated, while its sleek, slender shape will slip easily into bags, briefcases and backpacks. Best of all, the insulating double-walled design will keep hot drinks hot, and cold drinks cold, for hours on end. Even better, thanks to this smart vacuum technology, the outside of the flask will stay cool no matter what’s inside.