Ortleib velocity backpack for mountain biking

Wily-Quixote
Wily-Quixote Posts: 269
edited August 2017 in MTB buying advice
After thoughts on a backpack.
The bag is predominately for commuting but I am lucky enough to have some mountain bike trails on the way to work so stability on downhills is a nice to have.
I currently have a Deuter cross 20 air which is on its way out and, TBH, I don't particularly like it. I am only 5'8" but it never sits right, I can't get it to sit on my hips.

I am looking at an ortleib velocity (24l) but my only concern is whether it would be stable enough for the mountain bike ;part of my commute.

anyone use this bag for mountain biking?

cheers,

wily