Remember that you can combine different methods as well to carry what you want. Anotherwords, you can have a wallet survival kit, necklace survival kit and keychain survival kit at the same time. It can be whatever you think works for you. Just try to keep it to a minimum.
However, I must stress that you need to know more and possess more skills with these sorts of kits, at least in general. There is a popular saying that, "the more you know the less you need to carry". The reverse therefore as I see it is, "the least you know the more you need to carry", and this is to compensate for a lack of skill-set and knowledge base.