Northcore Keypod

Just place in your items, choose a solid anchor point on the car (or any safe place) to secure the padlock shackle, close the lid and shackle and set the combination. Keypod is a simple, robust, portable, weather resistant, secure storage safe for keys and other valuables designed to deter would be thieves.
It has a four digit combination padlock with an integrated storage cavity which is large enough to hold all known modern electronic vehicle keys (and keyless keys), household keys, spare change, credit cards and even some mobile phones. It's an essential piece of kit that's going to last for years.