The Ortlieb Back Roller is an easy to use pannier for your bike's rack. The material is 100% waterproof and all seams are sealed for complete water protection. The bag can be mounted on either side, and if you so wish you can buy another one later on. QL3.1 mounting system: Purchase a separate [QL3.1 mounting kit](https://scandinavianoutdoor.com/ortlieb/varusteet/laukut/pyoralaukut/ql31-mounting-set/?currency=eur&delivery_country=fi), install it on your bike rack, and click the Back-Roller Free bag on and off with record-breaking convenience! (In previous model years, the kit was included with the bag, but now it is sold separately). - Free model: does not contain PVC - IP64 protection: dustproof, rainproof - Roll-up closure - Shoulder strap - Flat inner pocket with zipper - Reflectors - Welded seams - Five year guarantee - Made in Germany - Main material: tarpaulin-like, easy to clean PD620 - Bottom, front and rear panels: more supple, still extremely durable PS 490 Volume: 20 lite