This saddle bag is the perfect size for 2 Gravel Road Tubes or 1 MTB Tube, 2 CO2 Chargers, 1 Patch Kit, 2 Tire Levers, 1 Multi-Tool, a set of loose Allen Keys, a Tubeless Tire Flat Kit, a Packable Windbreaker, a set of Arm Warmers and maybe a little bit more! You will be seen with the reflective strip that will keep you safe day and night.