If there is a will there is a way. But I would say that the mower has been designed that way for a reason. For example, if you have more weight on the back, it will make the front lighter which would make you unknowingly lift the front of the mower up every time you take a step. Also the extra weight put on the bag mounting points could be a concern. If it was possible , the lawnmower manufacturer would have likely had it as a purchasing option so they could make more money.... but needless to say of course you can make one, it may just take some creativity.