Ibera Bike Strap-on SeatPak Saddle Bag This IBERAUSA SeatPak saddle bag comes in two different sizes: extra small or small The saddle bag attaches to the seat post and seat by Velcro straps for easy and quick attachment or removal Can carry smaller items like keys, a wallet, a snack, and more while you ride! Note: comes in two sizes: extra small or small Strap-on Velcro Attachment