Our standard seat is a single flap that opens front-to-back. Also available for no additional charge are 3 split seat options: double flap (front-to-back), double-flap (side-to-side), and triple flap (front-to-back). Split seats are a good idea for the larger boxes for added versatility and to keep the seat weight reasonable (we tend to overbuild things) See photos to the right for the difference between a single and a split seat. (L-R: standard single seat, split seat with double flap side-to-side.) We can also make compartments in the box to line up with the double and triple split seat options for a small additional charge. Just let us know