Originally Posted by
mechBgon
Park Tool MT-1 and a Park Tool CT-5. Lightweight, strong and compact.

(mountain-bike tool kit shown)
I used to carry that Park multi-tool. The wrenches are too short for many uses. Now I carry this instead. The ends are different sized hex wrenches. Price is a few dollars at my LBS. They also have one with screwdrivers at the ends (one side is phillips and the other side is slotted).