4:32 p.m. on November 22, 2005 (EST)
I've done exactly the opposite from this, No Sleeping Bag, but a pad well sort of. I've posted this on both www.backpacker.net (Trip Reports Forum) and on www.backpacker.com (Northwest Trip Forum)
October Overnight 'sans' Down 'Bag
Recently this late October up in the Alpine Lakes Wilderness (WA state) about 4,200-ft, I did a dayhike that ended up being an overnighter, sans sleeping bag. The next lake over from me 500-feet higher and 2-miles away had 4+ inches snow on the ground.
Because this was a Dayhike where I planned for lousy weather (typical this time of year) and wanted to enjoy a hot lunch I had packed some extra's. When I got to Snow Lake, I didn't want to leave after just a few hours so made the ballsy decision to stay overnight.
I had my Sil Tarp 2 rigged with a single trekking pole, a half width cut reflective Sportman's Blanket/Ground Sheet, and my Thermolite (reflective) waterproof Bivy Sack which I was looking forward to give a REAL test.
During the night the wind picked up immensely coming off the lake it if not for my windshirt or packlite shell it was fierce enough to kill someone if they were trapped outside without any protection. It blew hard all night and all morning long.
I took a photo of myself holding my Sil Tarp up and it was flapping like crazy all horizontally as I held it above my head with arms stretched wide. It didn't take long at all for that intense wind to dry it out the following morning when I packed up my campsite.
After dinner, watching my bonfire die down, I went to bed at 12-midnight without changing into spare Capilene bottoms (didn't have any), but I did have a pair of thick Pile Booties and change of socks. I wore these and a pair of El Cap fleece Pants (Patagoina), a Mircofleece Zip-T and my new Down Sweater (5.8-oz's 800-fill), and my Packlite III GoreTex shell over everything, plus a light fleece hat and for my hands a cheap pair of Mircofleece Gloves and Lobster Claw Rain Mitts.
I removed the gray Evazote pad from my Zero Sarc and stuck my legs inside the Pack while I was concooned in the Thermolite Bivy.
Everything worked well except for one small oversite on my part. My Evazote Pad in the Pack was not long enough nor was the tiny 12" x 18" Evazote Sit Pad and together I had to decide where to place the insulation to best suit me. I later moved the larger pad to under my thighs but it still left a huge gap of space and in the end I was freezing after only one hour's time!
I estimated the temperature at around +35 degrees, lots of breath seen in the air, but no frost on the ground. I did have condensation on the underside of my Tarp.
So I got up rather quickly put my boots back on and scoured the immediate area for more twigs to get the FIRE going again, and finally when flames were going on the huge pile of coals I went searching for log material all the time wondering when ole' Mr. Bear might come looking for my food bags.
I discovered that thick Bark burns best and fed what became my 11-hour Bonfire partially sleeping briefly against a rock face wearing my Down Sweater just 3-feet from the Fire and sitting all night on a huge, flat piece of 2-inch thick Bark.
To sum it up with the clothing system all I needed were 3-more items.
1. My 48" long Evazote Pad so my entire body would have insulated from the cold ground.
2. MORE Food!
3. A Water Bag - the two trips down a steep, rocky slope to get cooking water with only a tiny Titan Kettle (28-fluid oz's) was a cold waste of precious time. My 2.5-gallon (4-oz)collapsible water bag or even a 3-qt Platypus bladder would have been ideal.
The reflective Thermolite Bivy worked surprisingly well for what it really is. But turning over inside, the Velcro kept opening up and I wished for a drawcord to close up the gap and a hood would make a nice improvement. I don't remember having any condensation inside but then again I was IN the thing for only an hour.
A longer Evazote Pad was ALL I really needed. I remain totally convinced I've have achieved a decent night's sleep if my E'pad were...longer.
I learned alot, what worked and didn't and in the future I could see myself going bag-less again but not in late October, more like early Sept when all the bugs are history.
If you are packing the right clothes, layering system with a change of spare Base Layer(s), and my Down Sweater again, and a 1/4-inch thick, 20" x 60" Evazote Bivy Pad (6.5-oz's) with a Thermolite Bivy would take up very little space and would make a nice emergency system in conditions where rainfall is not a threat.
Next time I'd like to do it with my GTX Bivy Sack and maybe a Silk Mummy Liner...in Sept well below 5,000 feet.
I whole heartedly recommend packing a 'reflective' Thermolite Bivy for Dayhikers, ...they work...provided you have a insulated Pad beneath you. :)
Around 7:30 a.m. I got back in my Bivy under the Tarp and actually slept for about 90-minutes.
I returned from my trip quite HAPPY, but due to the awesome wind coming off the lake I took in way too much smoke and my eyes were quite bloodshot when I crashed back on my couch at home. LOL :)
Note: I do NOT promote what I did for just anyone to just go out and do. I've been Backpacking and Dayhiking for more than 20-years now. I know my limitations and strengths. I'm experienced with my gear and have the knowledge to use it properly. I've been hiking in this respective area every single year in all seasons except Winter (i.e., deep snowpack) so am quite famaliar with the area and it's varied terrain. Lastly, prior to leaving for this Dayhike I followed the weather for over week on the news and informed my girlfriend the details about where I was going before I left the house.