The image is of someone just tossing their wallet, smartphone and keys in it and hanging it around their wrist, and the lazy way they carry it around is truly "lazily".

The triangular tetrahedron is a very reasonable shape for a carry-on pouch.

Once you have placed the 15mm tape around your wrist, you can easily open and close the bag by pinching the name tag and opening and closing the zipper to prevent the contents from escaping.

On days when you don't feel like carrying a sacoche or shoulder bag, why not try going out with an item like this?