This is a simple 1" wide cinch strap for connecting a small rear duffle, drybag, or pannier topper to your bike. It's a two-piece design with heavy duty webbing and no elastic to stretch or break. The straps quickly connect to the bike using lanyard loops, and they are adjustable from both ends, so they'll work with everything from a large rear duffle to a small pannier topper. They include strap keepers, so your excess strap lengths wont be flapping around in the wind.