Pack fit and performance starts here.
The K4 Hipbelt is included with every K4 Frame or K4 Pack System. This option to purchase a K4 Hipbelt is to facilitate any size changes that may be needed for users of K4 Packs.
The K4 Hipbelt is only compatible with the K4 Frame. It is not compatible with any other generation of Exo Mtn Gear frames or packs.