Even my clothing is super light. For most trips...I wear it.
Where I go, not having a change of clothes, and Goretex outerwear would be a life threatening mistake. I realize different areas have different requirements. I probably have to pack almost 10lbs of clothing that I'm not wearing. Extra pants, shirt, fleece, socks, and rain gear.
Add to that, a couple water containers (empty), a SteriPen,
Based on the OJ review, and other things I've read, I got the impression the SteriPen is little better than doing nothing at all?
Here's my list of "minimalist":
MEC Camper 2 Tent: 5.3 lb
Footprint: 0.7 lb
MEC Scout Tarp: 1.5 lb (it ALWAYS rains on a trip)
Therm-a-Rest Basecamp: 3.5 lb
Synthetic -7C Barrel Bag: 4 lb
Coleman 533 dual-fuel stove: 2.6 lb
GSI Soloist Potset: 0.7 lb
MSR AutoFlow Filter: 0.7 lb
Petzl Myo RXP headlamp: 0.4lb
"Swiss Army" knife: 0.3lb
19.7lb
That would be for a solo canoe trip, or motorcycle camping. Both allow a little more leniency on weight. I could easily paddle with 400lbs of gear in canoe. But portaging is the issue. The pack I use depends on the trip. Could be a large traditional internal frame backpack. Or dry bags.
The tent I chose, I went for more room and durability, including the footprint. The tarp is necessary to be comfortable when it's raining. The foam thermarest is a bit heavier, but it's durable, and wider than ultralight versions. Ditto the barrel bag. The stove is heavy, but it's also rugged, and I don't need to worry about expensive and hard to find cylinders. You can run it on gasoline if you want. I guess this shows what is possible with a slightly less costly, and more roomy camping setup. 20lbs is still not bad for a "full size" mattress, sleeping bag and tent.
I've still left out a lot of things I typically bring.
Spot Device 0.3 lb
Bear Spray 0.7 lb
Garmin 76CSx 0.5 lb
First Aid kit 0.5 lb
Lighter
Waterproof matches
Compass
Pack Towel
Sport Sandals
P&S Camera
Toiletries
For dual canoe trips, I bring luxuries like a full-size GSI pot set and dishes. Spices. Spatula and ladel. Basically everything to cook "real" food. Heck, even the "real food" weighs a considerable amount. You're basically carrying water.
One thing that I think would be a really neat innovation would be to make a complete tent/mattress/bag system. Why do you need a tent floor? Make the mattress the tent floor.