The connection part of the back strap is carefully sewn. The shoulder strap connection is a resin buckle, but most large mountaineering backpacks use the same material. If you are worried about the resin product, you can connect it with a 6mm rope with a little ingenuity. I used a lot of wooden stakes for surveying, but there was no problem with the strength. If you want, I think the nylon tape at the back strap connection should be a little longer. There is no problem with using it by a man with a height of about 172 cm, but it may feel shorter when used by a larger person. Anyway, I am satisfied that it can be used for a long time even if it is used roughly in the field work.
(Translated by machine.)

The connection part of the shoulder strap is plastic, and it seems to be broken at any moment. I bought this because this one-size-fits-all guy was involved, but I was disappointed. I have no intention of using it. I'm giving up because it's a mail order.
(Translated by machine.)