The Ortlieb Rucksack Adaptor converts your pannier into a backpack. It can also be compained with any Ortlieb bike pannier with a QL1 or QL2 mounting system.
Ortlieb has designed the Rucksack Adaptor to be comfortable. It has a thermo-moulded back surface, with padding adjustable shoulder and chest straps give you the best comfortable fit. It is also breathable by having a carrying system that allows air ventilation at the back.