Since recently acquiring a DM 7 and finishing my first quilt, I've been looking at drysacks. Then I thought, could you make a really large drysack to use as an inflatable UQ? You could still stuff additional insulation in it, but sealing it off would trap the air.
Anybody ever tried this? Or did I sniff too many down clusters last night?
how heavy is material for making dry sacks and inflateable mats? seems like it might make for a heavy uq. it could possibly be done, but it seems like it's the actual insulation that keeps you warm. for instance the un-insulated ba's aren't very warm at all. down or synthetic would still probably be the best choice for the insulation and you could use a much lighter shell material if it wasn't air tight. you would get additional effects of a vb though.
I was contemplating/dreaming of something similar with my existing dry sacks, similar to what could be conceived as "removable Clark pockets." Rather than one large dry sack, I have often thought that if there was a way to easily attach a string of dry sacks together to form a UQ, and have some lightweight compressible lining/insulation to stuff in those sacks, it would be the cat's meow for me, as I always use dry sacks when canoeing, and they would then be dual use. I like dual use items. I just haven't figured out a way to overlap and string the dry sacks without ruining the integrity of the sack. I also haven't put a lot of thought or effort into it - it's one of those things that flies through your brain in the wee hours of a long night.
Maybe creating one large dry sack would be the way to go - although it might be a little bulky to use. Lining it with something like insul~bright would probably be enough for an air mat type UQ.
I would look for something lighter that regular drysack & inflatable mat material. What's the lightest sil made? Kite material? Might end up being a little noisey too.
I was thinking a large sack could double as a pack liner or a bivy. Or a really big water sack.
Was just at Walmart. Wonder if these could be used.
Ziploc Big Bags
XXtra Large 2 ft. x 2.7 ft., 3 per box
Yeah, but you still run into the same issue as my dry sacks - how do you combine/mate them, so you have overlapping insulation and no cold spots where they join? That's the dilemma.:confused:
I suppose you could overlap the bags, then tyvek tape them together. You could then fold them into your pack. But then why not just get some of the extra large vaccuum style storage bags? Those would hold air better, as well as be waterproof.
OK, gimme credit for searching before just starting another thread . . . ;)
I was reading a current UQ thread where the discussion turned to baffle height vs. overstuff, and it seems to me that insulation (down, in that case) simply creates dead air space. Does the down itself yield insulation value? If not, then why wouldn't an inflatable UQ perform just as well? Or could the air baffles be perhaps 6" deep to perform as well? It would definitely pack lighter and smaller, and hey--- air is cheap where I live!:laugh:
Has anyone tried something like a dollar-store inflatable raft like you'd use in a swimming pool, just to see if the air pockets had decent insulating value? If they did, then I'm picturing an inflatable UQ with squared-off baffles for even insulating value, maybe pre-molded to the shape when hung, and with some skirting to seal the edges . . .
Anyone care to set me straight?!?
Originally Posted by Klaussinator
It doesn't work because of convection currents within the air mattress. Insulation filling the voids blocks the convection currents. That's about all there is to it.
I have froze sleeping on a 3"-4" air mattress on the ground and on a cot several times (I was a slow learner), while a 1.5" thick Therm-a-rest mattress (due to the foam filling) keeps me warm in the same conditions.
Ahhh, convection currents.
Consider me edjumacated! ;)