The Back-Roller Core is the low-cost starter model from ORTLIEB, yet sacrificesnothing in terms of quality, sustainability or waterproofing. After all, it goes without saying that the Back-RollerCore is produced in Germany, can present its precise product carbon footprint and guarantees a long lifespan. TheBack-Roller Core starter model is a single bag with a volume of 20 liters intended for the rear luggage rack; it can befastened on the left or right side of the bike.Waterproof bike pannier ideal as commuter model+ QL2.1 mounting system for racks up to 16 mm+ Sides of PS490, front and back of PD620 material+ 18 mm & 20 mm hook avialable as separate accessory (e. g. for e-bikes)+ Prepared for Stabilizing Insert+ Including reduction pieces for tube diameters 8, 10 and 12 mm; with anti-scratch function reducing abrasions on rack+ Top QL hooks and lower sliding hook adjustable without requiring any tools+ Lower hook rail made of two-component „hard-soft“ synthetic reduces abrasions on carrier+ Can be used individually (e.g. for shopping, sports, picknick)+ Highly reflective Scotchlite reflector+ Easy to clean insideheight:42 cm (16.5in)upper width:32 cm (12.6in)bottom width:23 cm (9in)depth:17 cm (6.7in)weight:820gvolume: 20L