Gregory Stout 45L Back size: M Purchased in 2016, used for hiking about 10 times. While there is no serious damage or hydrolysis, please understand that this is a used item and no returns or refunds will be accepted. The original rain cover is also included. This model is from about 2-3 generations ago, so the back length cannot be adjusted. I am 176cm tall and it fit me perfectly. In my opinion, since it's an older model, the fabric is more durable and can be used roughly. I'm selling it because I haven't used it recently, and I hope someone else can use it.