Piper, Yohei was one of the very light ones. I have a thing or two to learn from his methods. I really liked the simplicity and clean, uncluttered packing style he had.
Before modern times Japanese tended to travel very lightly. Long distance walking was part of their culture, especially because they had few big animals for transportation and didn't use many wheeled vehicles until the end of the Edo period. The heavy backpacking style of today was introduced by the British back in the 1800's. Most stores still stock mostly traditional weight gear, but all the big hiking magazines are now actively and frequently publishing articles about UL techniques. A lot of the people who joined Glen for his hike here, including Yohei, are at the forefront of the UL movement and have become quite famous nationally through the magazines.