Re: Military Packs for Hunting?
Granite Gear makes nice side pockets. Attatch them with short nylon web straps & plastic QR buckles.
REI sells the straps with buckles sewn on.
Side pockets are great for carrying gear you want in a hurry like 1st aid, potty kit, water treatment, etc. They usually increase pack volume by about 800 cu. in.+ or -, per pair.
"There are no comfortable packs, only packs that are less uncomfortable than others."