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==Fill==
[[File:compactsleepingbag.jpg|thumb|300px|A highly compact sleeping bag measuring 23
Many [[insulating materials]] are available for sleeping bags. Inexpensive sleeping bags for warm weather use or use by children indoors typically have a layer of synthetic quilt insulation. Outdoor professionals and serious amateur adventurers usually prefer either synthetic fill (e.g. [[PrimaLoft]]), or natural fill (e.g. [[down feathers|down]]), and they have debated the merits of these materials for years.
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