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Basically it boils down to "less weight for the same insulation" in favour of the mummy type for two reasons: In a blanket type bag you have more or less two insulating sheets, one on top and one ...
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Basically it boils down to "less weight for the same insulation" in favour of the mummy type for two reasons: In a blanket type bag you have more or less two insulating sheets, one on top and one ...