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I highly doubt the op will still check this, but go to ebay and just search "assault pack."
You'll find the bag that the army is actually issued, and it's great. 100 bucks for the multi cam version, and it's a spacious bomb proof bag with incredible stitching. Mine held up for 6 years of marches, training and ftx, and I wasn't nice to it, and it wasn't new when I got it. Yet it still went back to cif clean as a whistle, you can't beat that.
For the more serious expedition, upgrade to the actual ruck with a frame, another 100 dollars. Same quality of the first bag, just bigger, with a belt, and frame. The assault pack can attach to the ruck via the straps on both bags.
The only real downside to the bags is the actual weight of the bags themselves, but I've spent weeks hauling those things up and down mountains, packed full of shit, and lived. They aren't for ultra light, but they sound like what you want.
In my personal life, I've actually fit a tent and clothes and food into an assault pack, for reference. Picture related
