I've used this a few times on mountain trips, but there's no noticeable dirt or damage. I'm selling it because I haven't been using it much. It's been washed. There's a small stain on the outside right side pocket, and the drink pocket on the harness shows some wear (the elastic is stretched). Please refer to the manufacturer's website for product details, but I think it's very easy to use as a fastpacking model. 【Color】Midnight 【Capacity】30L 【Weight】690g 【Material】100D Nylon 【Accessories】Rain cover, bungee cord, cord lock Thank you for your consideration.