Alien II Multi Tool
My wife and I just got ourselves new bikes, and, five miles into our first ride, discovered that the allen screws holding her handlebars in place were loose. Too bad we hadn't had something like this Alien II Multi Tool at the time! With seven different sizes of allen wrench, three different hex bolt wrenches, a chain tool, spoke wrenches, and many more essential bicycle-maintenance tools, it's a fantastic addition to anyone's bicycle bag, and could easily avert an emergency on a long trip. $28.05 USD.