I have a GR2 and I love it! As for tough, I highly doubt you'll find a tougher backpack. I've carried absurd amounts of weight in it and while wearing and it still stands up. I've done a GORUCK Light and a Challenge and yes they do build better Americans. All I can tell you is that if you buy one, you'll never have to buy another bag because they're damn near unbreakable. Worth every dime!