Thought Id post my 2 cents.
First I only bowhunt so it will be from a different prespective.
I have a J104, J107, and Blue Widow
. Ive tried many packs as Im kinda a bivy elk hunt nut. And E packs do exactly what I need. Thought my Mystery ranch CC was gonna be "IT" but like the Bluw widow better.
The BW carries a heavy meat load closer to my spine than any pack the !)& is close but you can feel sag from the scabbard and opposing pocket area.
I guess the Blue widow can have a scarrard added so this might be a option to check out.
If you haul heavy meat loads out, Ive found it makes a difference.
Ive carried entire cow elk boned in one trip with both the BW and J series, both good but only use my BW anymore.