"it's awfully silly to worry about ounces when you are 10, 20, 30 lbs overweight"
Well this is heading way of topic bit. But the don't worry about your pack when your overweight statements always annoys me. I think its exactly the opposite. I needed to focus on lightening my pack before I could lighten my gut.
When I started backpacking I weighed about 80 pounds more than I do now. Some college friends were going backpacking and I wanted to join in. I first went to REI and was outfitted with the standard gear. Of course I didn't weigh anything but I would guess I had abouut a 40 lb baseweight. I went twice and had a miserable time and didn't get out again for 10 years. Needless to say, not backpacking didn't help my physical condition.
I then read an article in Backpacker on the Lightniks vs. the Heavyniks. They had a couple of traditional packers and a couple following the Ray Way and wrote about their experience on a group trip. Backpacker called it draw but it was clear to me that the lightniks were having more fun, i.e. less physically beat down for the entire trip, while the heavyweights got to enjoy their camp chairs and other luxires for a few minutes each night while tending their blisters before they collapsed.
I got Ray's book and a google search turned up BPL. Armed with this new info I got my base down to 20 lbs. I discovered I could hike about 5-7 miles a day and still have enough energy to get up the next day and do it again. This opened up the backcountry to me. I wouldn't have made it more than a mile up the trail if I still carried the 40-50 lb pack.
I spent the better part of two years slowly losing the weight while hiking farther, faster and with more pleasure. I'm now down 80 lbs and up to 20 mi/day.
For me lightening the my load was the thing that made it possible for me to get out. Otherwise I'd probably still be in the same shape I was 10 years ago, or more likely worse.
So no, it is not silly to worry about ounces when one is overweight and/or out of shape.
Climbing down from my soap box now and to work on my gear for a high sierra trail hike.