Love the classic toploading rucksack style! It can fit a ton of gear but only if you want to break a strap 5 miles from the end of an otherwise nice day.
I think my camelback ROGUE is much smaller but built with the user in mind. my old rogue camelback has straps that are integrated into the bag in a much stronger way. The Arete 18 is still a decent bag however I wouldn't plan on filling it up.
This review was written in the old system and had content requirements that are different than reviews written today.