Feb 7, 2009 at 1:22 pm #1233871
Just curious, how many of you have ever gone with just a bivy in temps down to 32F?
Is it as uncomfortable as it sounds?
How long does it take to gather the materials required?
-EvanFeb 7, 2009 at 2:55 pm #1476085
John S.BPL Member
Doubt many have tried. You will likely be uncomfortably cold and will be wishing the sun would come up. Go ahead and try it, but take insulation just in case it is too much for you, as it will be if you are only in a bivy. Down to about 50ish you might get away with it.Feb 7, 2009 at 3:15 pm #1476091
@rcaffinLocale: Wollemi & Kosciusko NPs, Europe
> Is it as uncomfortable as it sounds?
Not at all.
By 3 am, it is even worse.
CheersFeb 7, 2009 at 3:50 pm #1476095
Steven EvansBPL Member
I guess it would depend on what you are wearing. Sleeping in an Expedition/Himalayan mountaineering suit is probably fine down to 32F, whereas sleeping in a set of BPL Thorofares would obviously give different results. You planning on just bringing some camp insulation and leave the sleeping bag at home?Feb 7, 2009 at 3:52 pm #1476096
Yeah, just wearing 3 season clothing inside. Thinking about trying it on a car-camping trip with a sleeping bag as backup in summer.Feb 7, 2009 at 4:11 pm #1476100
@maynard76Locale: New England
going to sleep with out a bag is easy,
its waking up ever again that will be hard…Feb 7, 2009 at 7:30 pm #1476131
@walksoftlyLocale: Piney Woods
I have found that when it gets down to only 55 or so at night that I can get by with a mummy liner and a heetsheets bivy (for wind & rain) and be comfy.
I tried using a WM Flight jacket and Monbell down pants and found that they would take me down to the mid-40's if the wind was calm.
Down to freezing? I think that you could fall asleep OK, but am afraid that you would wake up in the middle of the night and wish for some real insulation. Getting back to sleep would be problematic.
The only way I would try it is if I could build a campfire and use a heetsheets blanket set up as a tarp behind me to trap the heat. Not a very weather-worthy shelter, though.
My $0.02Feb 7, 2009 at 7:39 pm #1476133
@dirk9827Locale: Pacific Northwest
I understand the urge to test limits of any setup. Do you currently go out overnight in warmer temps with a bivy sans sleeping bag? How does that work out for you?
I guess I find myself carrying pretty warm bags (15 and 10 degrees) all the time here in Washington for no other reason than I like a warm and toasty bag. I feel positively wimpy compared to those who carry minimalist bags or in your case, no bag at all!
DirkFeb 7, 2009 at 8:12 pm #1476136
Joe ClementBPL Member
Build yourself a debris shelter with the bivy inside, and bury yourself in leaves.Feb 7, 2009 at 9:40 pm #1476151
Dale WambaughBPL Member
@dwambaughLocale: Pacific Northwest
An easy test this time of year is to try it in the back yard fist– assuming you live in the right climate. With a pad and no wind, you could tough it out for a night, but it sure wouldn't be "recreation" unless you have masochistic tendencies :) There's a big ol' gap between surviving and comfortable! Like others said, it loses it's "flavor" about 3 AM.
And who's to say it won't drop another 10 degrees and REALLY make you haaaaaappy. Or add a 15mph breeze and turn you into a polyester popcicle?
That's why great grandad built a big ol' fire when he was out there with just his wool blanket. But we don't go there, and we don't cut down a couple bushels of boughs for ground insulation, etc, etc.Feb 7, 2009 at 10:20 pm #1476163
Just to let yal' know, I would never actually try the bivy thing out except in summer with a realistic backup and bailout(I hope my parents would't lock me out, lol)
-EvanFeb 7, 2009 at 10:32 pm #1476168
@cooldripLocale: "Grand Canyon of the East"
I have been caught out a couple times on a forced bivy without a bag and it wasn't alot of fun. Both times were on summer climbing trips, nighttime temps in the low 40's. It was pretty impossible to stay warm; we had no pads, no belay jackets, just storm shells. Both nights we gave up and just started climbing again, in the dark, but it seemed safer than becoming hypothermic. I've also done this intentionally on a really light, LIGHT climbing trip. 2 foamies, 2 belay jackets, a bothy and a puppy pile. I lived, but I will never, NEVER plan on bivying without a bag again.
That being said, I think what you are proposing is incredibly dangerous. When on that light alpine climb, I was at the peak of fitness, with nearly 20 years of outdoor experience under my belt, and I was accompanied by two equally fit, experienced partners. We knew EXACTLY what we were doing and were well aware of the potential consequences. More weight would have made the climb nearly impossible, so we made an educated, calculated judgement. Not a guess, and not hoping for the best. And it still turned out far worse than we thought it would.
Try it in your yard if you want; set an alarm so you definitely wake up and can check your status. After you nearly freeze, forget about trying it ever again. A quilt can weigh as little as 11 oz. If this is too much weight, stick to day hiking, in warm weather. I hate doing body recoveries in the snow.Feb 7, 2009 at 11:21 pm #1476185
@rcaffinLocale: Wollemi & Kosciusko NPs, Europe
Actually, I have done that ONCE.
We were running in a 24 hour InterVarsity orienteering race, and I managed to sprain both knees leaping down tall buildings – or whatever. Night was coming and it was clear I was not going to make it to the next checkpoint-with-support. So we found a farmer's shed with a wood floor and an old canvas tarp, wrapped me up in it in my running clothes and parka (that's ALL I had), and my mates went off to the next checkpoint to get me rescued.
It got dark, and frost formed outside. I couldn't move my legs much by now, so I put myself into a trance-state and … waited. Kept my head warm and let the rest chill down. Real cosy stuff – but at least I was out of the wind.
Around midnight the support crew found my shed and me, carried me out, put me on the back seat of a car, and drove me back to the checkpoint with a fire and warm drinks and warm clothing. Yeah, I was OK by the morning.
A cold night can be awful long …
PS: my team did win the race. 2 out of 3 finishing was acceptable.Feb 8, 2009 at 12:50 am #1476194
Evan, let us know when you discover a lighter, more efficient form of insulation than a down quilt/bag.
In those conditions you can ditch extra clothing, but not your primary, most efficient form of insulation. It doesn't make sense from a lightweight perspective, let alone a common sense, safety perspective!Feb 8, 2009 at 10:28 am #1476232
@hotrhoddudeguyLocale: New England
I tried it once in Utah, it was maybe low 40s with a micro puff and a pack for my legs, it was also the day i punctured my torsolite about 45 times, it sucked more than anything and eventually I got out my sleeping bag and lost the bet. The three others trying did not fare so well either. I may try with a feathered friends frontpoint, with 13 oz its probably capable of going to mid 20s, but my legs will probably get cold, and I would use a huge nice pad, because it would be fitfull sleep.Feb 8, 2009 at 12:58 pm #1476255
@ryanLocale: Northern Rockies
Any alpinist worth his salt will tell you that willingly undergoing such misery is to be avoided in lieu of getting off the mountain and pushing through the darkness of night.
Alan Dixon and I did what was supposed to be an easy alpine ice climb in the Tetons some years ago. Early start, zip up to the top, back down for dinner type of thing.
We arrived in Jackson ready to roll at 8pm, grabbed a burger at Billy's, and looked for a motel. They were all booked.
"No big deal" we'll just take emergency bivies with us and grab a few zzz's on the trail.
We hit the trail at 11pm, were asleep by 12:30am, woke up freezing (it was 35 degrees) and shivering at 3:00am, finished the approach at 7am, started the climb, got engulfed in a storm at the summit at 4pm, descended an unknown route on the other side, reached the base at 6am, hallucinated our way to the car, and ate purple pancakes at Jedediah's at 10am.
Jed's was an out of body experience, but I'm pretty sure both of us agreed between mouthfuls of syrup, "we should'n'ta bivied on the way up…" which certainly drove our decision not to spend another night on the mountain without a sleeping bag, electing instead to rappel down a 2000 foot couloir with 13 pieces of protection and a 30m x 7.9mm rope. Do the math: uninsulated bivies at cold temps pretty much suck.Feb 8, 2009 at 3:02 pm #1476291
Mark VerberBPL Member
@verberLocale: San Francisco Bay Area
There have been a few nights where for version reasons I was out in cold weather with a sleeping bag or quilt. Long story short… it sucked! The first time I tried to sleep and found I couldn't because I was so chilled… and I sleep pretty warm (I have slept in 15F weather under a 1lb down quilt rated for 32F wearing just a baselayer and warm hat). You need 2x the insulation to sleep as walking around camp and almost 10x the insulation then when you are climbing hard. Most of the other nights I was stuck without a bag I spent the night alternating between resting and doing isometrics to stay warm. The one night I was able to sleep there was a lot of pine needles and a tree hollow which make a nice little den.
As other have said, you can't match the weight/warmth of a good down sleeping bag or quilt… except maybe something made with a aerogel.Feb 8, 2009 at 4:11 pm #1476320
There are many possible ways to go without a sleeping bag, including wearing lots of insulated clothing, making hot water bottles and hot drinks, building a fire and building or digging a shelter. The other option is to just shiver/exercise all night and pray for the first rays of dawn to thaw you out.Feb 8, 2009 at 6:10 pm #1476340
Excellent topic – and I'd like to add another scenario to this at the end my post.
The full down mountaineering suits reminded me of the following fellow: I work at a winter camp in central MN for Boy Scouts in January and February. Last weekend I had an adult leader, a man of about 6'0" tall and all of 300 lbs sleep outside under a very crude tarp with three snow walls without a sleeping bag. He had a bag suitable for the conditions and his size, but declined to use it. The temp low temp overnight was between 10 and 20F (I never got a good read, but it was NOT in the single digits F). He was on two full length RidgeRests and slept partially sitting up (I think he had some form of sleep apnea). Anyway, he was wearing what looked like a full suit that was meant for deer hunting – read: sitting on a cold, cold stand for hours on end. Under than he had a layer or two of fleece and/or wool. He was fine, somehow.
I own and have paged through Tom Brown's survival book many times. It is an excellent read for those "Oh, crap" situations that we all hope we never, ever get into. I think this situation falls into those categories. If I was outside in those temps w/o a bag I'd make myself a bivy-like debris hut and pile leaves and other natural insulating a few feet deep. It would take a while to do, keep me warm while I was doing it and hopefully keep me warm overnight. Absent that, I think Ryan is right – when all else fails, you can simply keep walking or otherwise hike out.
On to a similar topic: what is the coldest you've pushed a sleeping bag overnight? What were you wearing, what was the temp, shelter conditions, etc?
My current foray into this field is to see how far I can push my Marmot Hydrogen (32F, 800 fill down) with a single 3/4 Ridgerest and a sit pad under my feet. So far, I have taken it into the low teens three times and last night it hit 8F, my lowest yet. I was wearing the following:
generic thin wicking gloves
generic poly pro bottoms
Smartwool Mountaineering socks
I was sleeping in an ID MK1 XL with another person. My toes got cold initially at about 3 a.m. and then again at about 6 a.m. I ate a few hundred calories of gorp overnight and drank about 8 oz of water. I was otherwise well-hydrated and fed.
What about you?Feb 8, 2009 at 6:18 pm #1476342
For what its worth I slept or should I say sivered all night with nothing but one of those silver space blankets just to see if I could. It only got down to 35 and I can say with all honesty it sucked. The funny part was me trying to light my stove at 4am while shivering so hard I could not keep my match lit. I think the main reason was that I was too warm for most the night and was sweating then I got chilled. I was fine till 3AM then I got really cold. Now I always carry a space blanket and a lighter. AliFeb 8, 2009 at 6:40 pm #1476350
@dirk9827Locale: Pacific Northwest
How many calories would one have to consume to keep the body warm enough in 35 degrees to stave off the cold more effectively? Between lost sleep and lost energy, I would have to think that trying to go for multiple days without good insulation (whether it be a bag, leaves, or whatever) would have debilitating effect on your ability to press on and dramatically cutback the number of miles traveled.Feb 8, 2009 at 6:54 pm #1476355
John S.BPL Member
At rest and no fire at 32 degrees, it can't be done with any amount of calories. A simple fire alone could work with no insulation. Exercise would help a great deal.Feb 9, 2009 at 11:01 am #1476477
Over multiple days, I would think the extra food you would need to carry (for shivering or exercising to keep warm) would outweigh the savings of not carrying a bag. That is, unless you are gonna go survivor man style and hunt/gather all your food…Or if you happen to be wearing some down pants and jacket with hood. I've always been intrigued by the concept of the Nunatak Raku : A sleeping bag you can wear as a jacket, or the Jacks R Better line of wearable quilts. Then you could brag that you went without a sleeping "bag"!Feb 9, 2009 at 11:47 am #1476488
@maynard76Locale: New England
People die when its 40 let alone freezing. If you survive the night count yourself lucky.
Now if you allow clothing it can be done with high loft jacket and pants, but it becomes glove vs mitten. Its much,much more efficient to use a bag.
If you allow fire and you know what your doing, its easily done, but remember you will have to sleep in 2 hour fits and wake up to feed the fire.
If you allow shelter -its possible,but you really have to know what you are doing.Feb 9, 2009 at 11:58 am #1476491
>you really have to know what you are doing.
Well, yes. Our ancestors managed somehow. No doubt they were tougher than us and knew a lot more about how to really survive (not just the pretend survival most of us do on a trip). Then again I understand they needed to consume around 5000-6000 calories per day, so probably spent most of their free time hunting and gathering rather than strolling through the lovely woods.
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