You need to carry a spare tube and this is the way to do it.

• bags with hooks will fall off! This bag won’t because it straps to the front forks
• main compartment holds a standard duty 21″ tube that you can use in the front or rear tire
• also holds short tools like CO2 cartridges in a separate compartment (so the tools won’t tear the tube)
• 1000D Cordura sides and top, bottom of 22oz. trucker’s tarp vinyl, plastic hardware from National Molding, YKK zipper
• lower profile than other bags, stays more out of the way of the headlight
• included straps allow you to carry the punctured tube home, strapped to the bag itself
• 3 year unconditional guarantee