Pattern 1937 Ammunition Pouch ("Small") Typically, two Bren gun magazines were carried in each pouch, but a pair of 2-inch mortar bombs would also fit. Sten gun magazines would not fit properly, but the pouches were also used for these. Riflemen would also carry bandoliers of rifle ammunition and grenades in the basic pouches. Men not in infantry units received cartridge carriers until midway through the war, when the cartridge carriers were replaced by the basic pouch for men of all arms. The contents of the Basic Pouch were usually restricted to ammunition. Loops on the inside of the top flap were designed for .303 calibre ballistite cartridges (used for firing grenades from a cup discharger on the Lee Enfield rifle). The pouches could hold bandoliers of rifle ammunition, various types of grenades, bombs for the 2-inch Mortar, magazines for the Bren Gun or Boyes Anti-Tank Rifle, or magazines for the Thompson machine carbine. When the Sten Gun was introduced it was found the 30 round magazines were too long to allow the Basic Pouch to be done up. A water bottle could also be carried in the pouch, in lieu of suspending it from the brace ends or wearing it in the haversack.