Hi there, picking a pack is rather important especially because most of them are crazy expensive here in SA. I have no experience with the Aonijie packs but have been looking at moving away from Salomon due to some quality concerns I have and the obvious price tag that comes with the name...having said that they are super comfortable.
I have also looked at the Ultimate direction and lately the Compressport kit.
UD is a sortof middle range pack price wise in any case but I feel that most of their packs are packs rather than vests.
I personally prefer a vest as I hate something bouncing around all the time.
I have not done that type of distance so you might want to look at something a bit bigger, i.e. a pack.
I have used Fox packs and also some of the Camelback packs which were also comfortable but not specific to running and therefore the Salomons of the world are better suited.
You can also have a look at Innov8, they were going to leave SA but have decided to keep supplying.
Best idea is to go to your nearest stockist and try it on. Nothing like a backpack that you have to run with for a long while that is uncomfortable and impractical as per your needs.
Look at fit as the biggest motivation and then storage (sometimes the storage at the back is difficult to access whilst running and therefore you may want more storage up front etc etc.
Quality is important as it needs to last you a while. Check zips and stitching and overall manufacturing quality.
Hope that helps a bit.