Arundel calls this bag the Dual because it's designed for carrying two tubes. As you may have noticed, seat bags have been shrinking over the years, as though the smaller the better. But some have gotten so small; you wonder how people can fit anything inside them. We've removed some of the tedium of actually filling your saddle bag with the necessary items for an emergency. This Arundel Dual Seat Bag with Roadside Flat Tire Repair Kit has everything you'll need.The Dual can contain two tubes, two CO2s and inflator, tire levers, and a thin tire boot inside the simple single cavity. Maybe even a few Allen keys if you go with light tubes. For all that space, the Dual still has a minimal profile. There is a single Velcro strap that loops through the seat rails and around the bag. No second strap wearing through the finish of your seatpost. The bag is narrow enough to nestle in place without abrading the inside panels of your shorts. And there's a genuine leather patch stitched to the back of the bag to protect it from wear caused by rubbing the seatpost.The Arundel Dual Seat Bag with Roadside Flat Tire Repair Kit includes a Black Dual Seat Bag, a Genuine Innovations Microflate Nano w/16 Gram Cartridge, a Park Emergency Tire Boot, a Park TL-1 Tire Lever Set, and a Continental Presta Tube -- 36mm, 48mm, or 60mm valve.