In reply to SenorVivo:
If you actually want to consistently sleep together, and can justify the cost, I would suggest a double sleeping bag. We have a Big Agnes one for base camp type duties which is much more pleasant than two mummy bags zipped together, especially as there is a draught collar in between the two sleepers.
Synthetic versions are relatively cheap and not too heavy (sleeve to slide mattress down the back so half bags). I think if consistently camping as a pair, a down double "half" bag - if you see what I mean - is one of the most weight effective solutions out there, but not as flexible as two down bags (which are heavier).
https://www.mec.ca/en/products/camping-and-hiking/sleeping-bags-and-pads/sl...
https://www.rei.com/c/double-sleeping-bags
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