The Nite Ize SaddleLite LED Flashlight Bike Bag SDL-M1-R3 packs has the plus of a bright red, weather - resistant LED sewn into its reflective back, which creates a tail light that oncoming traffic can see when you're riding in the dark. This Bike Bag from Nite Ize is a quality saddle bag made with recycled PET water-resistant fabric with a roomy bright white interior for easily finding items. The Nite Ize Saddle Lite LED Bike Bag is outlined with a passive reflective trim and a bright LED with two modes - press once for steady glow, twice for continuous flash (the specially-designed loop behind it makes it easy to activate). It's also removable so the bag can be washed without damaging the light. The attached flexible, reusable Gear Tie allows for safe, easy, and adjustable seat post installation, and the Nite Ize SaddleLite Bicycle Bag's reflective trim provides secondary passive visibility for added safety. Powered by two replaceable 2016 lithium batteries, included.