A credit card case in (food graded) silicone. It fits easily 4-6 credit cards, some (old fashion) paper money or if you prefer, some condoms. All to satisfy your needs. The silicone case is oil-treated to not attract dirt and to give that nice and smooth feeling.
To fit your personality, you have a multiple choice of candy colors to choose from.
Remember, Play it safe and always use your RUBBER M8!