Originally Posted by
bengreen79
Thanks for taking the effort to do this - very interesting. I commute in bike specific clothes since I have to change anyway. I feel faster without a backpack but I really think it's mostly a perception thing.
Me to, and wearing the backpack is my last choice of all reasonable alternatives so I wanted it to show a measurable drag. Maybe I should stuff it completely full, wear cycling clothes, try a bunch more runs and include some on the hoods, but even if I do eventually get a measurable difference it won't be much.
My theory is that with the looser shirt and enough angle of my torso and head, the backpack is in a turbulent area behind me and doesn't contribute to drag.