I seem to remember reading a post from someone Val_k Scott perhaps about the merits of "plastic coated" (for want of a better description) sleeping bags and tents in tents because of condensation.
The logic being that if you are sleeping in something that might generate condensation like a tent or trailer tent it's better to use "plastic" sleeping bags as they repel the condensation whereas cotton sleeping bags and duvets will get damp.
One double sleeping bag each for us as the singles are just too restrictive, I would love to take my King Size feather and down duvet with us too but we have no room left in the car.
Like jb41 said, it is better to have a fan heater going on low through the night to keep the cold out of the tent. (just make sure it is away from anything and on a sturdy level surface where it cant fall over)
Hi
the bags we use are breathable and let the moisture out, both ways but it dose condense on the inflatable bed even though we have a old four season bag under the bed and another 3 season bag across the top that is covered by a fitted fleece.
We have used a high tog quilt over the bags when we used to go in march but we found the EHU and a 2KW heater with a good thermostat the best option,
It keeps the tent warm all night and when val as to get out of bed it keeps her from moaning about the cold, you pay for it use it in the cold months. That is what they make heaters for to keep places were humans reside warm
Rex
------------- "Be the person your dog thinks you are" (BM)
Had a really cold miserable night a few weeks ago when the sea fret soaked all the bedding Cant think of anything that would have improved the situation as it was cold wet fog. Spent the night under the duvet trying to warm the air with my breath and praying for morning to come. It hasnt put me off camping though
I have a down mummy sleeping bag, so it keeps my head warm.
My feet are usually hot so there is a zip at the feet to undo. It is also useful for getting out of bed in the night when I do a little bunny hop across the tent. lol.
last weekend we put the double sleeping bag over the airbed opened up then just the kingsize duvet over us, BUT we did have the halogen heater on all night, it was very warm and cosy, as for condensation we dont get it as the diablo is a inner with a flysheet over, sorted,
Haydn
------------- THERS ONLY ONE TEAM IN THE NORTH EAST ......... NEWCASTLE
Whether to take a duvet or a sleeping bag? Well it all depends......
If you're backpacking or carrying your kit on a bicycle or a horse, then it has to be a sleeping bag.
Again, if you're doing a family trip and space in the car is limited, then it has to be a sleeping bag. (The kids can take a duvet of course because they wrap themselves up in them in the car so they don't take up much extra space!)
For trips in the late autumn and early winter I take both because as I go on my own with a car I can fit both in. In fact I use the duvet with the sleeping bag unzipped as an under blanket.
Would have thought double sleeping bags are a seriously bad idea for those beyond the romantic phase: when one person moves, the other does too!
Good advise from someone earlier to pack your bedding up during the day because of mists (which seem to penetrate anything, even plastic!) and dew.
As regards condensation, well get a cotton tent to sleep in rather than sleeping in a plastic bag: sorted!
I'm going to chirp in with another "it all depends".
Rectangular sleeping bags tend not to be as warm as tulip chaped "mummy" bags. The reason is simple, less space around the body is less space to heat. So if you took two bags, one tulip and one rectangular, both made with identical materials, the tulip bag would always be warmer.
Tulip bags still give you the freedom to curl up and usually have double zips, so you can poke your feet out. Obvioulsy they do stop you sleeping legs akimbo.
Rectangular bags can be zipped together to form a double bag, this can't be done with tulips. My OH hates this though. I sleep on my side,and the bag is too small to plug the gap between our shoulders.
So, reluctantly I have to take a duvet. It's not as warm as good a tulip bag, but it's close.
If you're planning on taking a duvet and pillows, get a vacuum bag - big enough to take a double duvet,four pillows and some blankets,it has an airtight zip lock and a valve. You're supposed to attach a vacuum cleaner and suck all the air out, but sitting on the bag works just as well. This will halve the size of your packed bedding. We got ours from Argos (pah! pah! pah!) don't know if they still sell 'em.
Up to you what you use. Do not expect the same solution to work year round, and use something thick between you and your airbed. Flock on PVC is not nice, and the airbed will be cold.
HTH
Mike Veal.
We take 2 super king duvets and put them in those vacuum bags, squishes them down flat. We usually just put them back in the vacuum bags at the end of our trip and lay on them to get the air out. We're usually the first ones to leave in the morning so we don't want to make noise with our airpump, but if you leave at a normal hour, use the reverse of your airpump to take the air out. They pack much smaller.
We just bought 2 king size duvets for £2.50 each at Wilcos big sale.
We also took our hated mummy bags and layed them under us and stuck our feet in. They are super foot warmers but hate to just take them for that.
H there I take both I used the quilt if its relativly warm as I dont really like being constricted in a bag but when its cold I take it as I find it alot warmer and it dosnt slip off the bed and annoy me all night either.
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Topic: Sleeping Bags or Quilts ???
Cant think of anything that would have improved the situation as it was cold wet fog. Spent the night under the duvet trying to warm the air with my breath and praying for morning to come. It hasnt put me off camping though 
