I recently went on my first ever international trip to Germany. I knew I'd be walking around a lot and going from hotel the hotel so I decided to get the nicest and most comfortable backpack I could. Boy, did I overpack! I ended up with this 105 liter backpack because I wanted to bring all the comforts at home. What a newbie mistake! This backpack is awesome and it did hold everything but man it was really heavy! So, I will not be traveling in the same manner ever again. I will have to downsize severely. my loss is your game. I bought this brand new at Cabela's for $250. It looks absolutely new. When you wear it you can actually stick your entire arm behind your back in between the pack and your shirt. It has these pads that sit on your shoulder blades and then another one that touches your lower back so that air can pass through and keep you cool while wearing it. It has a metal frame to hold its shape and the waist belt is extremely rigid and does an amazing job of transmitting some of the weight of the pack to your hips. This would be absolutely perfect for somebody who hikes the Appalachian Trail or goes on extended backpacking trips where they need to fit a lot of stuff. it's super expandable since it has so many compression straps all over it so even if you don't fill it up, it will stay nice and tight and not flop around. I still would like to own a backpack similar to this, just smaller. If you have something to trade I would be interested. The airflow on the back is the most important thing to me.
Here is a link to pack on Kelty's website: https://www.kelty.com/glendale-105/