Road Bike Seat Bag

road bike
(Road biking) Road cycling is the most widespread form of cycling. It takes place primarily on paved surfaces. It includes recreational, racing, and utility cycling.
A bike with narrow tires best suited for paved roads. Usually noted by drop style bars.
A bicycle that is suitable for use on ordinary roads, as opposed to a mountain bike
A motorcycle that meets the legal requirements for use on ordinary roads
A road bicycle is similar to a racing bicycle. However, road bikes are built more for endurance and less for fast bursts of speed, which is desired in a racing bicycle. They usually have more gear combinations and fewer hi-tech racing features.

seat bag
Saddlebags are bags that are attached to saddles.
Also called a "seat pack," this is a bag that attaches beneath the seat for carrying essentials.
a small storage accessory hung from the back of a seat.