The 1 Pound Pack-Rifle (And Fishing Pole!) A pack rifle is a rifle small enough to be carried in a backpack. They are generally chambered in small caliber cartridges, such as the .22 LR or .410 shot shell, and are used for hunting, survival and plinking. Nothing can come close to the compact and almost gravity-defying light weight of Mountain View Machine & Welding's Pack-Rifle. The single-shot bolt-action Pack-Rifle weights just 0.97 lbs!