Design a cooler that can be used on camping trips. Primary considerations in the design are weight, capacity, and how long the cooler can keep items cold. Investigate commercially available insulation materials and advanced insulation concepts to determine an optimum design. The internal volume of the cooler should be nominally 0.06 m³ and it should be able to maintain an internal temperature of 4.5°C when the outside temperature is 32.5°C.