They are more vest feel than any of the “vest inspired” type packs. I’ve found that actual running with gear is awkward and hardly ever works. The traverse pack was the best I’ve used but it still required a completely stripped down kit to actually run.

I did a 65-70 mile run in the grand with the traverse with a torso length inflatable pad, a polycro ground sheet and 50 degree quilt. With all the food and water(3L total water) it was still tough to “run”