All laptop RiutBags made from Cordura come with a chest or sternum strap attached. You can order this replacement in case yours is lost or damaged.
RiutBag straps are designed to allow chest straps to be adjustable, removable and replaceable. Replacement chest straps are compatible with the following models:
RiutBag R10.2, R10.3
RiutBag R15.2, R15.3
RiutBag R25, X25, X35.