Liners (or meat bags) are ideal for protecting the interior of the sleeping bag soil, avoiding washing too often and thus increasing the lifetime. These inner bags are either cotton or silk, and sometimes fleece.
Silk liners are very light (approximately 130g) and provides a heat gain of 1 to 2 ° C maximum. Cotton meanwhile is heavy (300-350g) and not heat, but it has the advantage of being cheap.
- Thermal linings
According to elaineqho, sometimes a sleeping bag or a little right temperature for some activities, and your budget does not allow you to buy one hotter. Thermal liners are a good compromise. The fleece lining allows heat gain up to 5 ° C.
A lightweight thermal lining has emerged in recent years, made of Thermolite (fiber widely used in sleeping bags) and developed by the Sea-to-summit. The announced temperature gain is 8 ° C but it seems to be closer to 4-5 ° C. Which for its weight of about 265g is very interesting!
A thermal liner can also be used alone as a sleeping bag for warmer temperatures.
- Bivy bags bivouac
In addition to a not closed shed, the sealed outer bag is a bag that you slip his sleeping bag and possibly his mattress .
The models made from Gore-Tex laminates, eVent breathable ripstop or are intended for immediate use to bivouac dry. This is the method used in the armed forces.
Lighter and cheaper models will be used instead of supplements in a small tarp to protect the sleeping bag in an emergency if you are forced to spend a night out.
The gain of temperature of outer bag is measured by EN 13537.
Your duvet does not warm you but retains body heat that you release. Do not go into your chilled down, you will have a hard time reheating.
-Rub your hands and feet
-A hot water bottle closed tightly at the bottom of the bag as a hot water bottle
-Start the night with a bonnet, 75 to 80% of body heat is released by the head
-Run a small 100m before entering your down, it sounds a little brutal, but effective