I always wear a small backpack when I hunt to carry calls, water, food, maps, gps,tags, etc. I just bought a small cammo bag that has a velcro loop that will velcro around the top carrying loop of my backpack. I carry my extra loads, extended jag, round puller, and 'T handle' in there. When I bow hunt I take off the smaller bag, when I BP hunt I just velcro it back on.