I'd use the proviso that your pack should be 25% of your ideal body weight. Some of us weigh a bit more than that, but we need to recognize that this is an extra burden for our joints. We actually should reduce the amount of pack weight to allow for the built-in extra "avoirdupois." It doesn't sound as though the OP has this problem, but I know I do!
May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey