Ultra compact seat bag is hidden under the saddle with hook and loop fastening strap. Rail Wing System allows quick access to essentials without removing the whole bag. The GearBag adds a hidden tool compartment that separates tools and personal items for better organization.Rail Wing system secures the Elementa SeatBag to saddle rails, even while removing itemsAn additional anchor strap provides extra secure attachmentBuilt in anti-slip strap secures extra gear to the exterior of the bag Topeak Elementa Seat Bag Seat Bag UPC: 883466039261