I have generally made it a habit to use my multitool, a pair of 8-10 MM wrenches, a set of tire levers, and a patch kit for most maintenance even at home. That way I am used to it and know what it can and can't do. Different bikes have different sizes and types of fasteners and the tools should be tailored to the specific bike. Even though the kits vary a bit with the bike the whole bag weighs under a pound for each of mine and stays on the bike even around home.