cause you can't possibly know, in advance, what you might have to do, and being seen with a gun might be worse than not having the rifle at all. The sleeping gear, spare clothing, cordage, bug netting, shelter gear, anything big and soft, can be rolled up and used as a frame for the pack Dye your underwear and socks, or buy them GI OD green, and they can be used to pad the shoulder and hip straps of a very lw day pack. Instead of wasting space and weight on padding that is otherwise useless. If your frame is external and of hollow tubing, a lot of small, useful, pointy gear, like fishooks, eye screws, etc, can be wrapped up and dropped down the tube, saving space and protecting your pack from punctiures. A hiker I met, who lived out on the road, used to hide his dope in his frame.