Being constructed in a Trapezium.
When closed:
Extends Temperature retention because the wall of the Tapered-Out-Base spiked into the acute angle of the tapered-In-cover firmly, prevents Temperature escaping out of box.
At the same time, Maximum Protection from contamination due to the intrusion of external source like dust or crawling insects. Especially during outdoor activities.
Supplying to the entire Military of Singapore. It is functional capability is attested by
DSTA - Defence Science Technology Agency
