The Original Folding is a versatile Reformer model, because not only can it be folded, but it can also be stored upright in an a-frame position once folded with the foot bar sitting flush on the floor to support.
The Rental can also be stored upright for easy storage. The below video gives you a demonstration for you to follow along at home:
The Studio and The Original are not designed to stand upright or on their sides and are instead intended to be in a space that is designated for the Reformer, where it does not need to be packed away.
*Please note that as with any piece of furniture that is not anchored to a wall, Reformers are a hazard to children. Ensure that kids are supervised to avoid them knocking the Reformer from its standing position and causing potential injury.