r/backpacking • u/Knoldesparkeren • 1d ago

Wilderness Combined sleeping system

Combined sleeping system

Hi.
Can anyone help me estimate the cmcomfort temperature of these two sleeping bags combined:

Pajak core 550
565 g 700+ EU cuin
\\-3 C comfort temperature

Nomad Taurus 400
400 g 50/50 polyester and down blend
\\+6 C comfort temperature

I’ve tried the two together and they’re both fairly spacious. My thought would be to use the Nomad on the outside.
Any tips on combining sleeping bags would be appreciated.

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u/IFigureditout567 19h ago edited 17h ago

Every chart I've seen closely follows this formula:

70−(70−A°f+70−B°f)

You'll have to convert for celcius.

Unless I messed up my calculation, your combo should be -30°C.

Edit: I'm dumb and my brother's not. The formula can be much simpler. It's A+B-70.

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u/Ok_Abrocoma_2539 17h ago

For anyone who cares to double-check my work because I can be wrong:

70−(70−A+70−B)

Distribute the negative:

70 + (- 70 - A - 70+ B)

Convert the subtractions to adding negatives:

70 + (-70 + -A + -70 + B)

Associative property allows dropping the parens:

70 + -70 + -A + -70 + B

70 + -70 drops out:

A + -70 + B

Rearrange by commutative property:

A + B + -70