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The only real difference is that in a one piece double you don't have zips so the insulation is evenly distributed. The zips add some weight over a one piece but not much - it also won't pack quite...
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#1: Attribution notice removed
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System
·
2020-05-27T11:08:42Z (over 4 years ago)
Source: https://outdoors.stackexchange.com/a/3960 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/