Originally Posted by
apricissimus
I don't know about back vents, but I would imagine they wouldn't be that effective on a bike since you'll be leaning over a bit and likely stretching the material against your back, and the vents will be shielded from the wind by your body.
The back vent on my burley was amazing, it just opened up like a big exhaust pipe. I think the air in came through my neck and just blasted out the back. The burley coat was baggy, which is not the way a lot of bike coats are designed.