Unfortunately, we cannot connect two mattresses together with a hinge at this time. We use the tape-edge method to attach the top, bottom and sides of the mattress together. This process completely seals the mattress all around the edges. We also use coils in most of our mattresses, which makes it very difficult and very expensive to create a separation between two coil units.  *What we have done in the past is build two, separate mattresses that sit next to each other. These can be stacked when access to under bed storage is needed.