Versipack main compartment is over 38% larger than the Fatboy S-Type. In addition, it has three zippered accessory pockets, two sleeve pockets, and one drawstring pocket fitted for a 32oz/1L Nalgene water bottle or a radio. The Jumbo S-Type has three places for modular expansion with other Maxpedition accessories using Malice clips. External keyper on shoulder strap for gloves and internal silent keyper for keys.