If You're often carrying heavy items, traveling by bike or just walking to school, then this modification will be really useful. The backpack function includes three rivets - two placed on the bottom of the bag and one near the upper handle. Tha same belt that is used to wear the bag on Your shoulder can be turned into bacpack's braces. 

Example of this modification can be seen in the attached photos - modified River Smaller bag.

This modification can be used only with selected mdoels. If You want to see if it can be added to the chosen bag, enter the "Accessories" bookmark (under product's photos, next to the "Description" bookmark) and check if the "Backpack function" is available (if so - just add it to Your cart).