Montbell V.B.P. Back Panel

Backpack back pad. It improves breathability and I think it will make mountain climbing more comfortable in the coming season.
For details, please check the Montbell homepage or online shop.
It was only attached to the backpack for trial and has not actually been used yet.
I bought a new backpack, so I no longer have an opportunity to use it. I would appreciate it if someone looking for this item would consider it. Retail price: 4400 yen.