I bought this because it seemed simple and easy to use. I opened it and tried packing it once, but it was too small for me, as I carry a lot of things, so I'm putting it up for sale. It measures 20 x 16 x 12 cm. I also liked that it has a place to attach a key. There are two outer pockets on the front, which are hidden from view. The outer pocket on the back is one large pocket, the size of the two front pockets combined, and it's transparent. I bought it for 1600 yen. It's unused, but I opened it, so I'll take 100 yen off the price.