I have a Lidl multitool that came in a saddle pack plus puncture kit, all for a fiver. The saddle pack lasted two years of over loading then a plastic buckle broke making it unusable, the puncture kit was amalgamated with other kits, but the multitool lives on and has been used on many occaisions on rides. It includes several spanners as well as the usual allen keys and screw drivers, though its a shame they are not the open C type. I also bought a workshop tool kit for about £20 and that has been brilliant with all the right tools for modern Shimano bikes which stand up to the level of use I give them fine, i.e. servicing and a couple of bike builds over two years.