Fastinstallation and removal. Install directlyto your saddle's rails. No extra toolsor hardware needed. Extra toughwith reinforced plastic material gives maximum protection to your stuff. 3M Scotchlite?reflective safety band makes you more visible to other vehicles in low lightfor that extra peace-of-mind. JAM FREEZipper High-quality YKK?brand zipper, durable and functions smoothly. EXPANDABLEAREA. Large size forQuickPack can be extended for extra cargo capacity. High-qualityvelcro seat post strap for additional stability. Special strapfor rear lights. Available in 3 sizes: S, M and L.