Abstract: An integrated bicycle seat cover and storage device with a seat-conforming cover connected at a rear end to the outer edge of an opening of a weather-resistant storage receptacle adapted to be secured to a bike adjacent and below a rear end of the seat. In a first form the storage receptacle is an open pocket mounted on the closure flap of a bike bag, and an additional outer flap on the bike bag covers the storage receptacle. In an alternate form, the storage receptacle is a pouch with an integrated horizontal closure, and includes means for securing it directly to the bike adjacent and below the rear of the seat. The seat cover can be deployed over the storage receptacle and the seat from front to back when removed from the storage receptacle.