September 2025 ( view all challenges )

The Seed Package

Imagine yourself on a train to Shanghai. You just bought some nuts in their shell, and it feels like snack time. Alas! Where are you going to put the shells? You have no bag, but you do have 15 cm kami. Of course.

So, here is your challenge. Design a small foldable bag for anything as small as nut shells, seeds, or small money you wish to keep together.

It must have an easy way to open and close, and a formidable lock, to prevent it from spilling its contents in your bag. And, of course, the bigger the volume, the better it is!

The first entry is by Tomoko Fuse, who contributed the diagrams. Note that you need to make a rectangle out of your square kami before you start.

Let's get practical!!

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