When a standard size seat bag just won't do, there's Xlab's Kona Bag. Its extra length lets you carry up to two tubular tires or a plethora of tubes and other on-the-road repair essentials. It even has two zip side pockets so you can organize and easily access your gear. What's more, it attaches securely with hook-and-loop and buckle straps.
Length: 9.75 inches
Weight: 79 grams