This is the perfect companion to your BMW top case. There is one main section that opens around on three sides for easy access with a 2-way zipper. There is also a smaller external zippered pocket that conveniently faces you when the lid of the top case is open. Kathy's perfect-fit top case liner has a padded bottom, and an easy-grab single handle plus D-rings to attach optional shoulder strap. Made of Waterproof DuPont Cordura, the toughest and most versatile material available for bags of this type. LIFETIME Guarantee!