If I have two sleeping bags with a lower comfort temperature limit of -5c and I put one inside the other does that give me a sleeping bag with a -10 lower limit? I’m guessing it might but if that’s so and I have two sleeping bags with 0 degree lower limits and put one inside the other what would that produce?

A portal into the demon dimensions.

A big sleeping bag 🙂

I’m sure my son did this question in a recent maths exam, I’ll ask him.

well your -5 allows you to sleep at -5 and you need to be about 38, so that’s 43 degrees of insulation.

2 x 43 = 86 so adding them together means you’ll be able to sleep at -48 degrees, obviously 😛

Seriously, I had a combi kit with 2 bags, I think they are rated 1.5 and 2.5 seasons and together they were meant to add to 4 season.

Your point of reference is incorrect. Recalculate using Absolute Zero as your baseline.

Work it out with the temperature in Kelvin instead then 0 isn’t a problem? 😛

I’m pretty sure you can’t just add up the numbers as it’s about the insulation levels, but I’ve no idea how you’d actually work it out – sorry!

No because each bag requires it’s ‘space’ to work.
SB

No help at all, but this is the best question I’ve seen asked on here for ages! 😉

If I put one big pair of Nikes over another pair, will I run faster?

That’s pretty much it. The inner sleeping bag won’t loft if it is compressed by the outer.

Should be ok with a buffalo bag though

druidh – Member

The inner sleeping bag won’t loft if it is compressed by the outer.

would a good fart not do it?

http://www.andy-kirkpatrick.com/articles/view/double_up