Lonsdale reflex bag the lonsdale reflex bag has a spring mounted design which is used to develop hand speed accuracy and timing the free standing reflex bag has a heavy duty base which can be filled with water or sand to weight it down and the height can be altered to best suit the person training ideal for use at home or in a gym lonsdale reflex bag spring mounted base can be filled with water or sand adjustable height easy to store lonsdale logo base diameter 4