Once you bring camping into the mix, packing light is not really feasible.Not that I would ever go this light myself, but you should check out Pete's gear list:
His gear weights just 6 pounds, 9 ounces, and he takes a tarp, sleeping bag, sleeping pad, bivy sack, stove, pot, utensils. He even has a pillow, for Pete's sake.
Yes that is true and I find that I am pretty comfortable when packing very light and camping and cooking. My actual trip weights have been a little higher than what was listed in that link since I often take a few luxuries, but I could go with that weight and be fine. On the Southern Tier I was carrying 14 pounds of gear, but that included some heavier than necessary items that were later replaced and some luxury items including a fairly big camera with an extra telephoto lens. I definitely could have easily left a few pounds of stuff home or taken some lighter items and still been very comfortable.
There are conditions where I don't like the bivy, but even when I take a tent I can still stay quite light. If biting insects aren't a problem I usually cowboy camp anyway only climbing into the bivy if it gets cold and windy or it rains. Trips where I think it will be hot, humid, and buggy every night I take a light tent, otherwise a bivy or a bug bivy work fine.
BTW, it doesn't have to be expensive to go ultralight since much of the reduction is done by eliminating things. There are fewer items to buy and you need less luggage to carry them. I can get by with a stuff sack under the saddle (or on the rear rack if using one), a stuff sack used as a bar roll, and maybe a tiny backpack. I think my gear expenses are probably less than average, despite the fact that I splurge on a few items including a very good and somewhat expensive sleeping bag and sleeping pad.
Going fully self supported with a very light minimalist approach probably isn't for everyone, but it is definitely possible and for those suited to it comfortable. Having done a good bit of it I doubt that I will go back to a much heavier style of packing.