This is a foldable bag. Size: When folded: 23 x 19 cm When in use: 47 x 27 x 16 cm (depth) It has a considerable capacity. There are three exterior pockets with zippers and one without a zipper. Inside, there are two smaller pockets. It comes with a shoulder strap. I've used it about twice, when my luggage increased on the way back from trips.