5:00 a.m. on April 16, 2009 (EDT)
I guess none of these count as true backpacking, but:
I have already confessed to packing a folding kayak into Madison Springs hut in the White Mounatins for the first kayak crossing of Star Lake, a little tarn all of about 100 feet across and 3 feet deep. That was with my wife -- an expedition Klepper with full accessories weighs over 100 lb., and the long parts make a seriously awkward load.
Another time when I was working on a USFS trail crew I hid a big watermelon in the bottom of my pack, packed it in 5 or 6 miles, and broke it out midweek on a nice hot afternoon, shared it with my co workers and a couple of surprised passing hikers-- our camp was hidden in the woods along a remote stretch of trail: "Hi! Want some watermelon?"
And then, doing trail work in New Zealand, I tied off an entire wheelbarrow to a pack frame and carried it 3 miles uphill to my work site -- actually easier than wheeling it up the rough trail.
Oh yeah, and then on a research project in the Adirondacks, we carried loads of lumber in lengths up to 16 feet up a steep path but only 1/4 mile or so to build platforms for our base camp, a Sears sheet-metal lawn shed kit, a propane powered RV refrigerator, a couple dozen heavy duty car batteries and chargers, lots more electronics and other equipment for the project and, last but nowhere near least, a 28 foot pneumatic personnel lift, carried up in pieces and reassembled at the site (we were working in the trees, mostly by climbing but there were branches we couldn't reach safely).
To make up for my sins, I spent about three weeks doing the John Muir and High Sierra trails in the Sierra Nevada without a stove or tent (had a tarp), fitting everything in or on a maybe 3000 cu in pack (North Face Wrapack, if anybody remembers those), with only two or three food resupplies. That's as light as I have ever gone.
BTW, for those of you with reluctant spouses and/or young children, I'll put in another plug for huts, where you can find them. My wife is actually an old hand at backpacking/camping, but we have come to appreciate the reduced loads and creature comforts we get using huts, and our kids are always enthusiastic about coming along, even on multiday tours with typically 20 km between huts. It's a different kind of experience, but makes it possible for families to get out and enjoy The Nature (as it's called here in Norway) even if you don't always get the solitude and simplicity you get with backpacking. For less hardy types, the comfort level is orders of magnitude better than tenting, especially in snow/bad weather. Depending on where and what kind of hut, you may not have to carry much more than your clothing, a hostel-type sleeping sheet, and a good book, and you can get a hot shower at the end of the day! A few huts here in Norway even have small rooms with double beds, typically a double-wide lower bunk, what I call a "second honeymoon suite", but if the hut isn't full you can claim the whole room to yourselves...