UPDATED:

Padded back carrying system for ORTLIEB bike bags including Back-Roller, Back-Roller City, Bike-Packer, E-Mate, Bike-Shopper, Velo-Shopper, Sport-Packer, Gravel-Pack, Sport-Roller and Sport-Roller City.

Turns a bike bag into a backpack with features including: additional load control strap for comfortable carrying of bags with auxiliary fastener (all Back-Rollers and Sport-Rollers except City and Gravel-Pack); multiple bag attachment points; Handle; small pack size (foldable lengthways) and minimal weight.

Note: Not suitable for bags with QL3.1 system!