For years, the military has been using simple chemical-based heating systems as a way to quickly warm prepackaged rations. Now the YABUL Cook translates such systems into a light-weight silicone device that is foldable and easy to transport. This product stands apart by putting the heating packets in a silicone container that rolls up for easy transport. The container also controls its pressure through a patent-pending pressure cap so the lid won't pop off as the steam heat builds up. [Source]