The SaddleLite LED Bike Bag packs the little extras you need on your ride, and has the added plus of a bright red, weather-resistant LED sewn into its reflective back. The light has two modes—press once for steady glow, twice for continuous flash. The two attached flexible, reusable Gear Ties allow for safe, easy, and adjustable seat post attachment, and the SaddleLite’s reflective trim provides secondary passive visibility for added safety. Weather resistant construction Bright white interior material to easily see bag’s contents Features easily replaceable 2 x 2016 3V Lithium Batteries Battery Run Time: 20 Hours Glow / 25 Hours Flash