u/Impossible-Movie-737

I'm looking for a replacement to my old Flash 22. I'm looking for something that has a similar volume but is more structured with better ventilation on the back. I'm hoping to lay it flat against the bottom of a travel bag and then use it for 6-15 mile of walking per day, both around cities and hikes. I'd like something that's also hydration compatible so I can use it as my go-to dayhiking bag when I'm car camping. My back gets really sweaty with the Flash 22 (and just generally in life), so I want something that's pretty breathable. I was looking at both the Matador Beast 18 and the Exped Skyline 20. I can't find many reviews of the Skyline and was hoping people here could give some insight.