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{{More citations needed|date=November 2012}}
{{Use dmy dates|date=October 2022}}
[[File:Mummy bag.jpg|thumb|300px|A mummy bag, so named because it has an insulated hood which keeps the head warm. A foam sleeping pad can be seen underneath the sleeping bag.]]▼
A '''sleeping bag''' is an insulated covering for a person, essentially a lightweight quilt that can be closed with a [[zipper]] or similar means to form a tube, which functions as lightweight, portable [[bedding]] in situations where a person is sleeping outdoors (e.g. when [[camping]], [[hiking]], [[hill walking]] or [[climbing]]). It is also commonly used indoors for people who do not have [[bed]]s or at [[sleepover]]s
There are a range of sleeping bag models designed for different purposes. Very lightly insulated sleeping bags are designed for summer camping use or
==History==
[[File:Three person buffalo sleeping bag.jpg|thumb
The "Euklisia Rug", from Ancient Greek εὖ (well) and κλισία (cot, sleeping-place), patented by mail-order pioneer [[Pryce Pryce-Jones]] in 1876,<ref>{{cite web|url=http://a-day-in-the-life.powys.org.uk/eng/home/eo_euklisia.php|title=Euklisia Rug|publisher=A-day-in-the-life.powys.org.uk|access-date=24 August 2013}}</ref> may have been the first forerunner of the modern sleeping bag. Pryce-Jones, a [[Newtown, Powys|Newtown, Montgomeryshire]] Welsh entrepreneur developed the bag and exported it around the world in the late 19th century. Documents show he sold 60,000 of these rugs to the Russian army – and the British Army also bought them. There are records of civilian uses among missionaries in Africa and pioneers in the Australian outback.<ref>{{cite web|url=https://www.bbc.co.uk/ahistoryoftheworld/objects/gh5qCU47Ryyc2fOqSjKiLw |title=A History of the World – Object : Euklisia Rug |publisher=BBC |date=1 January 1970 |access-date=24 August 2013}}</ref>
==Design types==
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A basic sleeping bag is simply a square [[blanket]] or [[quilt]], fitted with a [[zipper]] on two or three sides, which enables users to get into the bag and then close it up. A sleeping bag of this type is packed by being folded in half or thirds, rolled up, and bound with [[strap]]s or cords with [[cord lock]]s. The basic design works well for most camping needs but is inadequate under more demanding circumstances.
▲[[File:Mummy bag.jpg|thumb|
The second major type of sleeping bag, sometimes called a '''mummy bag''' because of its shape, is different in
The bottom of a sleeping bag typically does not provide significant insulation, because body weight crushes the loft of the insulation material. It is therefore necessary to use a pad or other less
==Fill==
[[File:compactsleepingbag.jpg|thumb
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.
Synthetic fill does not readily absorb [[water]], dries easily, and provides some warmth even when thoroughly soaked. These properties may save the user's life if, for example, the sleeping bag is accidentally dropped into water on a cold day. Synthetic material is also firm and resilient, so it insulates well even underneath a person's weight. However, synthetic fill cannot be compressed as much
Down fill weighs less than synthetic and retains heat better, but usually costs more. Down must be kept dry; a soaked down sleeping bag may provide even less insulation than no sleeping bag at all, leading to [[hypothermia]]. Newer, more technically advanced sleeping bags often have water-resistant shells and can be used in damper conditions. It is also recommended to keep a sleeping bag in a larger sack (storage sack) as opposed to
Other materials, notably [[cotton]] and [[wool]], have also been used for sleeping bags. Wool repels water nicely and also resists compression, but it weighs much more than any alternative. Cotton suffers from high water retention and significant weight, but its low cost makes it an attractive option for uses like stationary camping or car camping where these drawbacks are of less consequence. Cotton insulation does not provide warmth if it becomes wet (due, for example, to the sleeping bag falling into water), so cotton-insulated sleeping bags are not used by professionals or serious hikers.
==Temperature ratings==
▲[[File:Israel 2 021 Sleeping Rucksack-Tourist.jpg|thumb|250px|A person in a sleeping bag]]
In [[Europe]], the [[EN 13537]] [[standardization|standard]] (introduced in 2005) normalizes the [[temperature]]s at which a sleeping bag is rated for use. In March 2010, [[REI]] began requiring American manufacturers to follow the EN 13537 standard,<ref name=BP>{{cite web |url=https://www.backpacker.com/gear/the-ratings-game-standardizing-sleeping-bag-temperature-ratings |title=The Ratings Game: Standardizing Sleeping Bag Temperature Ratings |last=Pidgeon |first=Dave |website=Backpacker |publisher=Cruz Bay Publishing |access-date=15 April 2019 }}</ref> and in October 2016, ISO 23537-1:2016 standard replaced the EN 13537 standard.<ref name=ISO>{{cite web |url=https://www.iso.org/standard/67105.html |title=ISO 23537-1:2016 Requirements for sleeping bags |publisher=International Organization for Standards |access-date=15 April 2019 }}</ref>
* the '''upper limit''' is the highest temperature at which a 'standard' adult man
* the '''comfort rating''' is based on a 'standard' adult woman having a comfortable night's sleep.
* the '''lower limit''' is based on the lowest temperature at which a 'standard' adult man is deemed to be able to have a comfortable night's sleep.
* the '''extreme rating''' is a survival
The ''transition zone'', in between the comfort and lower temperature, is usually considered as the best purchase guideline.
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A sleeping bag's rating typically indicates the lowest temperature at which it will keep the average sleeper warm. For example, with a 0 °C bag, a person should be able to sleep in 0 °C temperature, but not necessarily comfortably.
[[File:Detske6.jpg|thumb|left|240px|Girls with sleeping bags at a [[sleepover]].]]▼
There is no standard measurement rating in the U.S., so a {{cvt|20|F|C}} bag from one company may not provide the same warmth as a {{convert|20|°F|°C|abbr=on}} from another company. Other important variables include what the user plans to wear while sleeping, what type of sleeping pad is used, and how well the user holds heat in the bag.
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==Indoor sleeping bags==
Indoor sleeping bags, sometimes called '''slumber bags''', are widely available, often for use, particularly by children. These are usually not designed to be weatherproof and are often made of natural fabrics instead of
The [[Icehotel (Jukkasjärvi)|Icehotel]] in [[Jukkasjärvi]], [[Sweden]] provides polar-tested sleeping bags for use while sleeping on their beds, which are bedded with reindeer furs
== Infant use ==
[[File:Woolrex_Merino_Wool_Baby_Sleeping_Bag.jpg|thumb|upright|A toddler in a merino wool sleeping bag]]▼
An infant sleeping bag is a bag-like [[clothing|garment]] or covering worn by [[infant]]s for sleeping in. Infant sleeping bags differ from regular sleeping bags in design and purpose, being designed primarily for indoor rather than outdoor use, and usually featuring either arm holes or [[sleeve]]s.
In the market, there are available for winter and summer baby sleeping bags. Also, some brands make all
▲[[File:Woolrex_Merino_Wool_Baby_Sleeping_Bag.jpg|thumb|A toddler in a merino wool sleeping bag]]
The definition used in the British Standard<ref>British Standard [http://www.bsigroup.com/en/Shop/Publication-Detail/?pid=000000000030168265 BS 8510:2009] Child use and care articles. Safety of children's sleep bags. Safety requirements and test methods.</ref>
== See also ==
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==External links==
{{SleepSeries2}}
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