Rifle magazines with storage containers have a first elongated tubular body defining an ammunition passage, the first elongated tubular body having an upper end defining an ammunition feed aperture, the first elongated tubular body having a lower end having a first floor plate attachment facility, a magazine spring and follower contained in the ammunition passage, a floor plate having a first attachment feature adapted to connect to the first floor plate attachment facility, a second elongated tubular body defining a storage passage, the second elongated tubular body having an upper end having a second floor plate attachment facility, and the floor plate having a second attachment feature adapted to connect to the second floor plate attachment facility.