Konnandou Asetoru-kun: For backpack heat and sweat countermeasures! Purchased new on Amazon in June 2025. Used only for one season attached to the back of a backpack. It certainly reduces the stuffiness and sweat stains between the backpack and your back! I am not tall, and the bottom part of the Asetoru-kun would catch on my pants' waistband every time, which was inconvenient, so I am selling it to buy a replacement. The product has no noticeable stains, but since it has been exposed to sweat, I have listed it as "slightly dirty." It was only used for one season, so I believe it can still be used for a while. Purchasing new costs 2600 yen (as of Autumn 2025). Why not try it out? ☆I plan to pack and ship using recycled materials.