Originally Posted by
noisebeam
That may be good on a (non-sport) motorcycle, but unless you cycle in a very upright position there will not be much effective reflective surface area pointing to the rear.
The largest effective area of most cyclists (regardless of BMI) is their butt, not their upper back.
Al
I never figured out a good way to make my butt reflective, so I put reflective tape on the bottom of my backpack. I also put some on the top of the front straps, by my shoulders.
I think reflective trim should be required on backpacks, considering how many school kids use them.