Saddlemen's Express line of saddlebags are available in two ways: Throw-Over style and Custom-Fit. Throw-Over style bags include a multi-adjustable yoke which hangs the bags from the fender or seat, and a quick-release bag connection to take off bags without disturbing the yoke or seat. Custom-Fit bags have a strong, smooth backside and no yoke, designed to allow custom mounting to your motorcycle. The extra-strong plastic back on all Express bags works perfectly with the S4 Quick-Disconnect Mounting System.