Hi everyone, Preston here.
To me, sustainable design is a design of an object which you improve on it and it is sustainable for everybody to use. In objects where other people need them but they could not afford it, that's where we need sustainable design in them. I think that a mini-portable refrigerator is what inspired him to make this solution. The mini refrigerator could be bought to the desert when you are hiking or exploring the desert and when you need a cold drink, you could simply use the mini refrigerator to make an icy cold drink. Or when your refrigerator at home broke down, you could use the mini refrigerator as a replacement.