PLENTY OF ROOM: Bike saddle bag with large capacity main pocket, you don't need to carry a bulky backpack or fill up Jersey pockets anymore, specially in long rides. It has enough room for long ride essentials. With 5 small pockets inside, neatly storage your cycling or commuting basics, even enough room for your phone.INNER COMPARTMENTS DESIGN: Two MESH POUCHS + one CLOTH POUCH + one elastic FIXING STRAP. It is convenient for you to separate CO2 cartridges, keys or some things which need to. The pump can be fixed by elastic straps, and the design of the thickened sponge on both sides can protect your phone and gears well.SEAT POST HEIGHT ATTENTION: Our bike bag under seat is suitable for most bicycles whose seatpost height is greater than 25cm. Please measure your seatpost height before purchase. Durable bike seat bag is great for day or any time adventures.TWO TAILLIGHT LOOPS: Reflective on bottle holder pocket and two available taillight loops. A small tail light can also be mounted on the back of the saddle bag for enhanced safety and visibility. (The tail light&water bottle don't include in the package).Great Construction: As a attractive and handy seat bag, overall shape is solid and not loose. Both sides are filled with sponge, feels comfortable. Especially, great storage with extra water bottle holder for long rides.