Purchased about three years ago. I bought it dreaming of overnight mountain climbing, but I only used it once and have been carefully storing it at home. There are no stains, deterioration, or hydrolysis. I've decided to sell it because I don't think I'll be doing any overnight mountain climbing in the future. I think the purchase price was around 30,000 yen. (Currently discontinued, Amazon selling price is 33,760 yen) Apology In the photos, I had included some with stains, but I have wiped them clean. I apologize to those who were considering it. The following is a product description. In addition to its unique frame structure, this model features a "Quick Adjust System" on the back panel, achieving quick fitting and outstanding stability. Furthermore, the hip belt, which firmly supports the main body around the waist, reduces the burden on the shoulders. It follows the body's movements and makes it easier to lift your legs, supporting comfortable walking. It is also equipped with functional features such as a large-capacity pocket using Aqua-tect® zippers and a top lid that can be removed and used as a separate sub-pack. It is suitable for 2-3 night tent camping trips. Specifications 【Material】Main body: (Front bottom/sides) 330-denier nylon ripstop [urethane coating] (Front top) 210-denier nylon ripstop [urethane coating] (Bottom) 1000-denier ballistic® nylon [urethane coating] Back: E.V.A. foam 【Weight】2.18kg 【Color】Dark Gray (GM), Blue (ORBL) 【Capacity】55L (Height 80 x Width 33 x Depth 22cm) 【Back Length】48～58cm 【Features】Adjustable top lid, top lid pocket, hidden pocket, delta lid, chest support, side straps, ice axe strap (resin tape), power mesh 2-way wand pocket, hip belt pocket, with pack cover, compatible with trail water pack Features Adjustable top lid, top lid pocket, hidden pocket, delta lid, chest support, side straps, ice axe/trekking pole strap (resin tape), stretch mesh 2-way wand pocket, hip belt pocket, with pack cover #Montbell #Backpack Size: 50-100 L