The patented roller 21 mounting system attaches the saddlebag to the saddle rails without any tools in comparison to ordinary saddlebags with velcro fastening the roller 21 saddle bags prevent abrasion with your cycling kit built into the roller 21 mounting bracket are two tire levers complementary with every roller 21 saddlebag of the range easily accessible and great for storing real ride essentials like an inner tube a micro tool a co2 cartridge and a patch kit made out of dura