The lightest, least expensive and most utilitarian multi-tool I know of is the Park MT-1 "dogbone". It has all of the commonly needed hex bits, a small screwdriver and some useful box wrenches, is very small and light and fits in any pocket or pack. It does not have a chain breaker but the CT-5 will do fine if you need one. I've used my chain tool twice in 35 years, each time to repair another rider's chain.