Hot Wheels Twin Mill Lunch Box. Distributed Thermos in 1998. It features the “Twin Mill” Hot Wheel. It is called “Twin Mill” because it has two motors. Since it was so popular, in 1969 they made a fully functioning full-scale replica of it which appears at car shows. This collectible Hot Wheels Twin Mill Lunch Box was never used. However, the thermos is not included. It is in very good condition.