When closed, the walls of the base, which is Tapered-Outwards, spiked into the acute angel of the cover that is tapered-Inwards. Preventing temperature from escaping out of box. (See arrow)

​Such design also prevents contaminations entering from outside the box. E.g. dust or crawling insects, especially during outdoor activities.

Keeping warm up to 4 hrs, it was awarded the winning choice for out-ration container used by the Singapore Military.