The Lezyne XL Caddy is an oversized high capacity saddle bag. Extra large adventure style seat bag. The Lezyne XL Caddy securely mounts to the seat post and seat rails with strategically placed straps to keep the bag stable. High quality durable materials. Roll-style enclosure makes for easy loading and compresses gear tightly. External draw cords hold extra gear. Reflective features and light mounts add additional safety. Highly water resistant construction.