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