Lezyne's Ex Caddy is an expandable wedge shaped caddy with a lower portion that unzips when more storage is needed. Labeled internal organizational pockets provide extra organization. A buckle system securely attaches the Caddy to the seatpost and seat rails. Durable woven nylon fabrics, water resistant zippers, reflective logos, and reflective tail light loop make this caddy ready for all weather and nighttime riding.