I agree with BIGGS regarding the Eberlestock Just One
As a longtime backpacker I have examined a LOT of huntiing backpacks including the Just one and its brother the Dragonfly
. Because the Just One is lighter than the Dragonfly and is almost the same design I chose it.
Becker's post on using the 1 liter pockets on each side is an excellent
idea. When backpacking (othr than hunting) I always add two side pockets for gear I need to get to right away like a potty kit, water treatment kit, 1st aid kit, coking gear, etc. I can expand my pack's capacity by 800 cu. in. with two side pockets.