I'm not too sure my percentage breakdowns are comparable to yours, but I didn't rearrange my gear list spreadsheet for this exercise. I have the spreadsheet set up for a 7-day trip, 3 seasons in mountains, total pack weight 25 lbs. I've tried to show what is hardware.

Extra clothing 10 .7% no hardware here
Shelter and sleeping 17.8% tent stakes, unless you want to count tent, bag, pad
Pack 8.0% I guess the stays are hardware
Cooking stuff, filter and water containers (no fuel) 7.5% mostly hardware
Navigation (maps, compass, whistle) 1.3% all hardware
Essentials--knife, light, first aid 5.2% mostly hardware
Other--toilet articles, camera, ID, car keys 7.2% camera the big one here
Food, fuel, 1 qt. water 40.5% fuel canisters

There's some rounding here because on my spreadsheet the percentages do add up to 100.0%.

The weights here do not include the clothing I wear (but do include anything around my neck or in my pockets) or my trekking poles (another piece of hardware). I carry my dog's sleeping pad (~ 3 oz.) in my pack, because it helps support my pack (Six Moon Designs Starlight) and because there's no room in the dog's pack. Otherwise my dog carries his stuff and I carry mine. I guess I should have done this with skin-out weight to include my trekking poles, the biggest item not in the pack. I also noticed that my glasses and watch (more hardware) are not even in my skin-out weight calculation, probably because they're on me all the time at home. I probably should have included my denture in the hardware, too--I did leave that behind once. <img src="/forums/images/graemlins/laugh.gif" alt="" />

Basically, the only unused items I have are the whistle and part of the first aid, which I hope never to use. Everything else gets used at some point or other! I have used the whistle on trips with the grandkids, to teach them what to do if lost or in trouble (hug a tree and blow the whistle 3 times--we rehearse this on every trip).