Bivouac sack: Difference between revisions
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#REDIRECT [[Bivouac shelter#Bivouac sack]] |
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{{Unreferenced|date=December 2009}} |
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{{R from merge}} |
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[[Image:Bivouac2.jpg|300px|thumb|A bivouac in winter at Benediktenwand, Germany]] |
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{{Short description|Protection when sleeping outdoors}} |
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[[Image:Tenaya bivouac 08534.JPG|thumb|[[Rock climbing]] bivouac in [[Yosemite National Park]]]] |
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A '''bivouac sack''' (also known as a ''bivy sack'', ''bivvy bag'', ''bivi bag'' or just ''bivy'') is an extremely small, lightweight, waterproof [[wikt:shelter|shelter]], and an alternative to traditional [[tent]] systems. It is used by [[Climbing|climbers]], [[Mountaineering|mountaineers]], [[Hiking|hikers]], [[ultralight backpacking|ultralight backpackers]], soldiers and minimalist campers. The bivouac sack has a larger, similar counterpart, called a [[bivouac shelter]]. |
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==Design== |
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A bivy sack at its barest is a thin waterproof fabric shell (for example, made from lightweight [[silnylon]]) designed to slip over a [[sleeping bag]], providing an additional 5 to 10 °F (2 to 5 °C) of insulation and forming an effective barrier against [[wind chill]] and [[rain]]. A drawback of a simple bivy sack is the humidity that [[condense]]s on the inner side leaving the occupant or the sleeping bag moist. This problem has been alleviated somewhat in recent years with the advent of [[waterproof fabric|waterproof/breathable fabrics]], such as [[Gore-Tex]], which allow some humidity to pass through the fabric while blocking most external water. Another solution is the use of an inner vapour barrier liner bag, for example a [[silnylon]] sack, to prevent body moisture from entering and condensing in the sleeping bag. |
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A traditional bivy bag typically cinches all the way down to the user's face, leaving only a small hole to breathe or look through. More recent developments in high-tech breathable fabrics have resulted in the creation of Gore-Tex Exchange Lite, an air permeable version of the fabric which can be safely zipped up around the user's head in order to shut out the elements completely. The fabric not only allows moisture to escape, but also the carbon dioxide exhaled by the user. |
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==Bivouac shelters== |
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Nowadays there also exists the [[bivouac shelter]] or "bivy shelter", a compromise between a bivy sack and a single-person [[tent]]. Often employing hoops over the head and feet, a bivy shelter is held sufficiently taut to keep the fabric off the occupant inside in order to prevent condensation from soaking into bedding. This style of shelter also provides some additional breathing room around the head. |
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Many campers gladly accept the increased carrying weight of a bivy shelter for the perceived increase in comfort it affords. However, the traditional bivy sack still holds its place among mountain climbers and [[backpacking (wilderness)|backpackers]], and is frequently carried on long or dangerous [[hiking]] or [[hill walking]] expeditions and high [[mountain]] climbs as a compact emergency shelter. |
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==Popularity== |
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In the UK, bivy shelters have become very popular among [[coarse fishing]] and large [[carp]] fisherman, who, in pursuit of their quarry, fish throughout the night. This upsurge in popularity has increased competition amongst manufacturers and designs have become more advanced. |
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==See also== |
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* [[Survival bag]] |
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* [[Swag (bedroll)|Swag]] |
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[[de:Biwaksack]] |
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Latest revision as of 19:43, 29 October 2023
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