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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'''
There are a range of sleeping bag models designed for different purposes. Very lightly insulated sleeping bags are designed for summer camping use or indoor use by children during slumber parties. Well-insulated bags are designed for cold weather use. The most well-insulated and lightweight sleeping bags, which are designed for serious hikers and adventurers, are more expensive than lightly insulated sleeping bags. One subcategory of cold-weather sleeping bags, the mummy bag, is so named because it has an insulated hood for the head. A [[bivouac shelter|bivouac sack]] (''bivy'') is a [[waterproof]] cover for a sleeping bag that may be used in place of a tent by minimalist, experienced hikers. A bivy bag may also be carried by day hikers as a backup or emergency shelter, to be used if they cannot make it back to their starting point by nightfall due to inclement weather or getting lost.
==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>
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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 several important ways. It tapers from the head end to the foot end, reducing its [[volume]] and [[surface area]], and improving its overall heat retention properties. Some bags are designed especially to accommodate women's body shapes. Most mummy bags do not unzip to the feet, because the zipper is a weak point in any sleeping bag's insulating qualities. Together with the tapered shape, this design feature helps protect the [[foot|feet]], which are more vulnerable to heat loss than other parts of the body. {{Citation needed|date=July 2009}} Another design feature is a [[drawstring]], equipped with a [[cord lock]], at the head end to help prevent the escape of warm air. A mummy bag often cannot be rolled neatly like a rectangular bag. Instead, it is simply stuffed into a [[stuff sack]] or compression sack.
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==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.
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==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>
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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 synthetic fabrics commonly used for outdoor sleeping bags. Children's sleeping bags in particular often feature elaborate, brightly colored printed designs, such as images of popular media characters. Slumber bags make floor sleeping more comfortable, and are often used for [[sleepover]]s, family visits, and other situations where there are not enough beds for everyone or someone does not feel comfortable sharing a bed.
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 and have frames carved from ice.
== 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-season baby sleeping bags.
▲[[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> For the safety of children sleep bags are "sleep bags for the use of children with a minimum weight of 4 kg designed to provide sufficient warmth to remove the need for additional bedding when sleeping in a cot or similar product in which a child is contained." It goes on to exclude "garments with sleeves and feet, i.e. sleep suits or baby grows, or to products designed primarily for outdoor use or to keep children warm when in a pushchair."
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