I got the neon green version of this on a sweet clearance deal. I'm certain the V3.0 is amazing too but I am cheap and I have some buddies that use this one so figured I'd give it a shot.
Longest run so far is about 13 miles, no chaffing noticed. I did a 10 mile run/walk/hike yesterday wearing the pack over a tank top and no issues at all with chaffing which is impressive.
I have had it for about 2 months now and I will say the most important thing to do with this pack is just take the time to put it on in different configurations to figure out how you need to tighten/loosen the straps. Depending on how much you have in the back bladder, stuff sack area and how much liquid you are carrying up front you'll have to make adjustments. I'm still getting this part down but once I have it dialed in it sits right in the middle of my upper back and doesn't bounce at all! In fact even when I don't have it quite perfect the only difference for me is where the front water pouches sit on my chest. I like them close to center so I end up messing with the back straps to get it just right. Either way no bouncing no chaffing and plenty of storage.
This past adventure I put my S22 phone in the front pocket in front of the water bladder I had in there (once the water was about gone) it didn't bother me at all.
If you like the less is more approach and need an open design so it's not like wearing a jacket when you run this is it!