I've tried a BUNCH of various sized packs over the years for BOB/Get Home Bag/Truck Bag etc... I gotta say the SHADO From PDW is TOP notch for both size, layout, function, comfort etc...
https://prometheusdesignwerx.com/collections/backpacks
Strongly recommend.
https://prometheusdesignwerx.com/collections/backpacks
Strongly recommend.