In today's fast-paced, streamlined world, bag will eventually be, the epitome of a "useless tool". Wallets, books, keys have lost their mass and are now encased in a smartphone, then in a pocket. Prehistoric tools leave a lot of room for creativity. This is because the object itself is outside the realm of convenience, and therefore the priority of design does not have to be given to rationality. What is the design and form that emerges from such a question? I use bags as a tool to search and explore tool designs that is not based on rational thinking.