A couple of days ago I found something like RAC LED reflective straps for £3. They're red - one can be clipped around your leg/arm and the other can be hang down from your bag or the seat tube (the elastic is stretchy enough to go around the saddle).
A couple of days ago I found something like RAC LED reflective straps for £3. They're red - one can be clipped around your leg/arm and the other can be hang down from your bag or the seat tube (the elastic is stretchy enough to go around the saddle).