This is a brand of ski and mountain sports equipment originating from Austria. It has a 70-year history, but it seems that it is not very well known in Japan yet. I bought it in Europe and brought it back, but I am selling it because it is unused. There is only one very small stain on the surface (the last photo), but it is barely noticeable. The opening method is different from a regular backpack. You cannot open the main compartment while wearing it. Please watch from around 16 seconds in the following video: https://www.youtube.com/watch?v=3xP003AYITo Here is the URL of the DYNAFIT product introduction site and its Japanese translation: https://www.dynafit.com/radical-28-backpack-unisex-08-0000048973?c=516578 The Radical 28 offers excellent comfort, durability, and a highly intelligent compartment layout for classic skiing. It is designed for ski touring enthusiasts who want a lightweight and practical pack without sacrificing comfort. Many arrangements are possible so that you can customize the pack to your needs. For example, the mesh back panel has EVA foam padding, which guarantees a comfortable fit. If you want to reduce weight, especially on ambitious tours, you can easily and quickly remove the padding with a zipper. Ski attachments and bottle attachments can also be easily removed. The Radical 28 offers a spacious 28 liters of space to store all the gear you need for backcountry tours. It uses durable coated ripstop nylon for maximum durability and longevity. Inside the pack, there is a special compartment for storing probes and shovels, allowing for organization. In addition, this model is equipped with a well-established safety box. The safety box is a compartment accessible from the outside, suitable for quickly storing items such as crampons. Furthermore, it has mesh pockets on both sides, reinforced shoulder straps, and fittings for attaching gear such as ice axes and helmets.