[header] How to put together a pocket survival kit [title] Get a container. [step] Most people use an altoids mints tin to put their kit in. If you can't get altoids, marks and spencers do a brand called curiously strong mints, which have a similar sized tin. 
If you want something bigger, places like b&q make plastic containers (intended for keeping stuff like screws in) that are suitable. Any container that you get should clip shut, so that it doesn't spring open.