Carabiners have a gate that is movable between a closed position and an open position, and a locking member that prevents opening of the gate when the gate is in the closed position and the locking member is in a locked position. The locking member is biased to the locked position. The locking member is also movable to a retainable unlocked position. Methods of manufacturing such carabiners include configuring a locking member of a carabiner to move between a locked position and a retainable unlocked position, and biasing the locking member to the locked position. Methods of using a carabiner include positioning a locking member in a retainable unlocked position, opening a gate of the carabiner, and allowing the locking member to at least substantially automatically move to a locked position as the gate is closed.