Not really a convenient way to do that either in my pack. No pouch. The Kiuiu guys suggested I buy a bladder pouch and hang it. No thanks. Pack fits awesome though!
Chaser did you solve for this? Same pack here. And I cannot comfortably reach around to the side pouches for a Nalgene. I use the waist harness pouches and do not want to remove them. Looking for something dry narrow to fit just behind the pouch.