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One reason (and I don't know enough to suggest this is the main reason) is for identification. When putting a tent up you may have a bundle of fabric that you need to set down on an uneven surface...
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#1: Attribution notice removed
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System
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2020-05-27T11:08:48Z (over 4 years ago)
Source: https://outdoors.stackexchange.com/a/14025 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/