Manufacturer: Osprey Model: Kresta 30 Used for about 5 years for ski mountaineering, etc. I think I used it 15-16 times a year. Although there is some dirt if you look closely, there are no noticeable scratches, stains, or damage, and I think it's relatively clean. This model is suitable for snowy mountains and backcountry, with features such as the ability to carry skis and snowboards, storage space for avalanche gear, back panel access, and a helmet holder. I think it's also easy to use on the slopes. Thank you.