Firstly, over-filled suitcases tend to break-up, if we Convert into an overfilled Suitcase, even we may break-up!
Secondly, Suitcases carrying valuables are sometimes secured using huge locks, if we Convert into that kind of Suitcase, even we may have to carry huge locks!
Thirdly, thieves love to steal Suitcases, if we Convert into a Suitcase, thieves may grab us and take off!
Lastly, if we Convert into a Suitcase, our wives may start using us a lot during shopping!