The Topeak Mini 9 is a great tool for most bike riders. It's minimalistic, and can handle the most common repairs. Not suitable for mountain bikes.
Pro Lightweight yet sturdy
The Topeak weighs only 0.2 lbs, and it can be folded up like a Swiss army knife, which makes it ideal for travel. Despite it's lightness, it doesn't feel flimsy. The tools are made from hardened steel, while the handle body is made from aluminum, making for a great balance between weight and durability.