The front bag uses the popular X-PAC. Attaches to the steering wheel with 2 Velcro locations. The inside orange fabric is cyber-treated to reduce dirt buildup. Coordinate with the POTARI Light X series and the Smart Easy Pack mini-X. The size of the bike does not ruin the image of gravel bikes, mini velos, small diameter cars, and road bikes. Professional roaders are also used during practice. Specifications: Size (Diameter 3.9 inches (100 mm) x Width 8.7 inches (220 mm); Capacity: 0.4 gal (1.7 L); Weight: 2.6 oz (75 g); Material: X-PAC, etc.