Nelson Rigg Route 1 Weekender Backrest Rack Bag This bag mounts directly to your luggage rack, sissy bar, or seat and is large enough to hold one full face helmet. Features Industry leading UltraMax fabric for maximum UV-protection Mounts to luggage/tour trunk racks, sissy bar or seat using quick release and self-fastening straps Holds 1 full face helmets Lockable zippers Reflective piping for enhanced visibility Waterproof rain cover included Rigid construction and solid base panel prevents sagging Lifetime manufacturer warranty 31 liter capacity ( 40 liters expanded) Dimensions: 14 L x 13.5 W x 10 H (13H expanded)