I purchased this but only used it once, so I'm putting it up for sale. Black, 25 x 36 x 23 cm Retail price: 3990 yen This is a foldable Boston bag. When unfolded, it's the perfect size to fit on one side of a 36L MUJI hard carry case. Use it as a sorting case when you go on a trip. On the way back, when you have more luggage, you can use it as a Boston bag. It comes with a belt that allows you to carry it on a suitcase.