I couple years ago I had a Sierra designs down bag with full gortex shell I loved it but it was a smidge heavier And noise when cold. It split a seam and they gave me a new bag the new bag had a zipper in the middle and you can get your arms out with arm pockets and keep the ba zipped right up. Best bag ever best design ever you would think the arm pockets flaps would be cold but that’s not the case bring your arms back in and they seal back up. I recently visited their sight and can’t find that model anymore but some other companies might make similar bags. Best thing out there if you can find one.
Just looked and it’s called the mobile mummy
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