Any of the Ortliebs rear panniers can be transformed into a backpack with the Ortlieb accessory. It takes about 10seconds to do the change.
Note- Since i got the Ortliebs i have a custom cut foam that fits the ends of the battery and this way it travels very safely and secured inside the pannier.
No more backpacks
unless necessary for other activities or i can transform one of the Ortlieb into a backpack with that accessory.Here:
Flexibility by bike and on foot! The Pannier Carrying System quickly converts your bike pannier into a backpack.
www.ortlieb.com