Thank you for viewing! This is a baby carrier and baby carrier/back carrier from BabyBjorn. It is a baby carrier called ONE KAI. I used it occasionally when my eldest and second sons were 0 years old. There is some wear and tear, but I think it can still be used. With a moderate hold, my children often slept in the carrier. My back also didn't hurt. It was a product I was glad I bought. Home cleaned. It will be packed compactly and shipped. The instruction manual will also be included. The regular price was 27,500 yen. Please consider it. ⭐︎Can be used from the newborn period (back carry from 12 months) ⭐︎The form of the baby carrier can be changed to suit the physique ⭐︎There are variations of facing in and facing out ⭐︎It's easy to use because you can secure the child in the baby carrier after putting it on ⭐︎Mesh processing for good breathability