This saddle bag for road bike displays both the practical and whimsical side of roswheel. While it may be PRO-like to ride with a tubular tire mounted naked under your saddle. unless you're using a high TPI tubular as a spare, it won't fold easily, leaving an awkward mess that doesn't easily secure. And if you've got a high TPI tubular back there, the toe strap could wear the sidewalls rather easily.A top tube bag for road bike designed to fit that tire, it has just enough room for a sew-up, a CO2 cartridge or two and an inflator. There are two small side pockets for loose tools and cash. A single strap in the middle of the bag goes around your seat rails and then the bag. There's a genuine leather tab on the back so the seatpost won't wear through the bag.