From the rulebook:
Page 62, Magic Weapons and Armour: "A figure may only carry one of each type of magic weapon or armour at any time, so only one hand weapon, one bow, one shield etc."
Page 63, Magic Items: "A figure may only carry one type of any magic item at any time, so only one ring, one staff, etc."
It seems to me that you may have multiple "Magic Items," but that they must take up a different slot.