This is an early model of the Yamato Michi MINI series backpack, now discontinued, with a body made of Skylight material. The size is M. I've had the body repaired twice after snagging it on bushes while hiking on variation routes. I was helped by the Yamato Michi repair department. Each time I sent it in for repair, I felt their care for their products, and I am grateful as a user. For regular mountain trips, it can be used without any damage if your load isn't too heavy (referring to Yamato Michi's recommended weight, which is for normal mountain trips). This is a model from the early days of Yamato Michi, and many participants in the Trans-Japan Alps Race (TJAR) used and loved it. In terms of weight reduction, it's truly a masterpiece of Yamato Michi. I rarely use it now and have it displayed on a collection shelf. Yamato Michi fans, and those looking for a rare type of backpack, will surely appreciate it. Unfortunately, I don't use it anymore, but I believe the backpack would be happy if someone who feels the same way about it could use it. The whistle on the chest strap has been used several times, so I will replace it with a new (genuine Yamato Michi) one before handing it over. The hip belt has been unused since it was new. The contents in the images are not included. They are for reference only. Material: UL/Ultra Light