This is the Arc'teryx Mantis 16. ① Used a few times, in clean condition with no stains. ② Convenient outer mesh pocket for umbrellas and water bottles. ③ Bright interior color makes it easy to see your belongings. ④ Padded back and shoulder straps with mesh for comfortable carrying. - Brand: Arc'teryx - Color: Black - Style: Backpack - Size: Approximately 45 x 28 x 9cm I think the size, usability, and design are all top-level. [Please note that I am not accepting price negotiations.]