I want to travel as light as possible. MUJI's "Bag-in-Bag Sacoche" makes this possible

I've been planning a trip next month, but I've been having trouble choosing a bag. I want a large-capacity bag so I can fit a change of clothes, cosmetics, contact lenses, a hair iron, etc. However, when traveling, there's a lot of moving around, so it seems better to have a light and compact bag to carry around. So I bought MUJI's "Water-repellent Mini Sacoche that can also be used as a pouch," which was renewed last year in 2023.