I used to run 3 flashing lights on the rear- one mounted to the rear of my helmet, one mounted to my seatpost below my rack, and one either mounted on trunk bag/backpack/seat bag. Needless to say I now only ride with two lights becuse I have lost 3-4 lights off of the loops on the trunk bag etc. I also use the ankle bands and have been told that they are great for visibility and the movement gets drivers attention. If you feel the need for more visibility go ahead and buy the vest and wrap it around your backpack. It will be a matter of preference, My current set-up as described is quite effective even on the last 4 1/2 miles of my commute where street lights are almost non-existent (maybe every 1/2 to 3/4 miles).