The opinion of Aventure Nordique
The shoulder harness will attach to either waist harness. The shoulder harness is highly recommended as it allows you to spread/alter the load between the shoulders, back and hips, as opposed to having the weight fully around your hips at all times. Only when very light loads are being hauled would we suggest using only a waist harness. We recommend using padded shoulder straps as they offer greater support and comfort when hauling loads over long distances for a long period of time.