Ford, Chevy, Dodge... Personally, I have 3 Eberlestock
packs (J107, X1, X3) for the integral scabbard to carry my rifle. The J107 is kinda big for a day pack, but, will pack all of the weight I want to hump. Just got the X3 and started doing practice hikes. I am hoping it will be the "sweet spot" in between the other two. Will know in October !
Other guys swear by the Mystery Ranch and Kifaru and Kuiu packs as well. They will be along shortly. Would be handy if you could find a few different varieties before hand and try them out. Let us know what you settle on.