Whilst I appreciate people's concerns about landing on a backpack and what may be in it, I think unless you carry a selection of knives in your bag it's probably a minor concern
Completely unrelated kinda, but I have a friend who was hit by a car when crossing the road, he rolled over the top of the car with his backpack smashing the windscreen and he landed on his feet behind the car. If it wasn't for his backback he would have probably been inside the car through the windscreen. So they can be a help or a hindrance!
The things I generally carry in my backpack would probably give me a bit of a bruise on my back were I to land on them - just be sensible what you put in it.
I did the 1200 mile round trip to the Nurburgring last year with my Kriega on and it didn't bother me one bit, in fact, I think it kept me a bit warm in the kidney area on occasions!
