Sleeping Bag Principle

To be shaped the day, it is necessary to sleep well at night. Obviously the quality and careful choice of bedding, and first of the bag, are therefore essential to the success of a hike, an expedition and even at the limit of any trip. And like anything else, it may be useful to know in advance the criteria for this choice as well as a few basic principles …

1-To stay warm

Principle

The role of a sleeping bag to keep warm its occupant.This heat directly from the occupant, the aim of the bag is to keep it in a small space all while minimizing wastage.

The quality of a sleeping bag is first function of the air layer contained within the packing. It is therefore important to consider the difference in volume between the compressed bag in its cover and outdoors. This difference will be more, the better will be its characteristics.

Also know that the top of a bag is always warmer than below which itself is compressed by the weight of the body according to transportint.

Important criteria

On a cold or wet floor insulation possibly slightly compressible (sometimes included in some beds) becomes useful sometimes to “save” up to 10 C. Similarly annexes accessories like covers bivouac, bivy bags or sheets down can improve the specific characteristics of a bag.

Heat from primarily the body and the bag holding it in a small space by not allowing it to escape, the “sarcophagus” will always equal characteristics outperform bags “blankets”. In addition to the form, so choose a model of good length (20 to 30 cm longer than its size).

Finally, note that the materials and manufacturing methods also play an important role in thermal level.

2-The packing

Without going into details, there are two types of trims: the “natural” and “synthetic”.

Natural Packing

The “real” goose or duck down is comfortable and protective. It allows the body to breathe and offers mostly good features. This lining is interesting primarily for areas of low to very low temperatures. Other advantages: low weight and good capacity to compression.

These duvets, with identical characteristics, are nevertheless often more expensive than synthetic, particularly in the low range. In addition they also require more care in maintenance level and are quite sensitive to moisture.

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