The idea behind this entry was to focus on something wearable that was also multi-functional. They swivel on a ring shaped plug and joining pin that the wearer can thread onto a chain or necklace. The Multi-Cards are designed to take on different functions based on the users needs. One is an ID card with important information about the owner. Another is a money storage card with a removable door. Last there's a multi-tool card that can accept standard razor blades, a nail for a scribe and even a bottle opener. These are just a few ideas for the Multi-Cards and more can be added. Each card is about 1/10'' thick, the money card being 3/10''. In total there is about 45 grams worth of plastic with the three cards and the plug/pin that holds them together.