I've seen a lot of TB bag videos and I know you can pack a ton of stuff into them. Just curious, how heavy is too heavy? I think I read somewhere that a backpack shouldn't be more than 10% of your total body weight. During my last few trips I feel like I over packed and my back definitely paid for it. I'm 5' 6" and about 134 pounds, I am trying to keep my fully packed Tristar under 12 pounds, ideally around 11 pounds. So, how much weight is too much?