Need a big ass backpack

Good day preppers!

I need a backpack that can store as much as humanly possible, attach as much as humanly possible, and be somewhat comfortable.

I'm a Canadian and considering the fact that we may be invaded by fascists. I have a place to bring my family to safety with relative ease. Should SHTF I will be joining the resistance and would need to carry at least 100 pounds of gear; ammo, shovel, axe, water etc you know the score.

Looking for a preferably non American made backpack with waist and chest straps that has an insert for BP plates.