The compact model is particularly suitable for tough MTB use due to its removable, fiberglass-reinforced plastic frame. It features a large main compartment with an expandable function for additional storage space, a separate top pocket with a zipper, a carrying handle, and a combined lamp holder and reflector. Contour bags are designed for bikes without a luggage rack. They offer plenty of space and some protection against splashes and dirt. Contour adapter (included). The compact, discreet adapter for mounting on all common seat posts allows for quick and secure attachment of a bag even on bikes without a luggage rack.