Physics:Sleeping bag liner
Sleeping bag liners are lightweight cloth sacks usually fitted inside sleeping bags to provide extra comfort, insulation, and help keep the sleeping bag clean.[1][2]
A thin liner may feel softer against the sleeper's skin, add 5 °F warmth to the bag (not pad), and be easily washed after use (unlike the thicker sleeping bag). A thick, fleece-like liner can increase warmth by 10-15 °F. Liners also allow a sleeper to use the liner alone, without the bag in hot conditions.[3] Optionally, bug-repellents, pockets, and a pillow holder can be added to liners.
A vapor barrier liner (VBL) is special type of liner that blocks the sleeper's moisture from reaching the bag, thus stopping evaporative heat loss. Usually a sleeping bag liner is used inside a VBL.
Sleeping bag liners are issued as basic kit by various militaries including the US and British armed forces.[4]
Fabrics
Liners are made of silk, cotton, nylon and polyester among others;
- Silk liners
- light, soft and strong and retain much thermal insulation even when wet
- Cotton
- heavier and bulkier than silk and absorbs water
- Synthetic [mix]
- usually light, strong, and do not absorb water
See also
- Bivouac sack – a small, lightweight, waterproof alternative to larger tent-like shelters
- Mosquito net – a type of meshed curtain that is draped over a sleeping area, to offer protection against bites and stings from pest insects, and thus against the diseases they may carry
References
- ↑ Dodd, Liz (April 22, 2019). "7 best sleeping bag liners to keep you warm under the stars". https://www.independent.co.uk/extras/indybest/travel-outdoors/camping/best-sleeping-bag-liners-10082198.html.
- ↑ "Sleeping bags and mats". The Duke of Edinburgh's Award. https://www.dofe.org/shopping/expedition-kit/sleeping-bags-mats/.
- ↑ "How to Choose Sleeping Bag Liners". Recreational Equipment, Inc.. https://www.rei.com/learn/expert-advice/sleeping-bag-liners.html.
- ↑ "Clothing for Operations 'The Black Bag'". Ministry of Defence. http://www.army.mod.uk/documents/general/Black_Bag_A5_booklet.pdf.
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