I bought my first portable painting easel that folds up and has a carrying handle so you can carry similar to a briefcase I assume. However if I were to carry it that way the drawer will fall out. Is it not meant to carry that way perhaps I assumed wrong? Maybe it has to be carried flat? I could always tape the drawer shut or tie a shoestring around it so the drawer doesn't slide out when carried. Any input on how this is meant to be carried would be appreciated.