Specifications:(from the manufacturer)
Major differences of the S-Type from the original Fatboy pack(from the manufacturer)
(1) The footprint of the S-type is in the MIRROR IMAGE of the footprint of the standard Fatboy.
(2) The S-type has an additional anchor attachment point where the cellphone pocket is on the standard Fatboy. It also has a 2" wide hook-&-loop fastener loop patch on the front lid for attachment of ID patches.
(3) The S-type provides more modular capacity than the standard Fatboy with three anchor attachment points.