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Sleeping bags can be heavy and bulky.  The models below are less than one kilo.

The Cumulus range seems to the lightest around. See also sleeping pads and pillows.

You may see a range of temperatures for a bag.  The general approach seems to be as follows:

•Comfort Temp: Rating based on a 'standard' adult woman having a comfortable night's sleep.

•Lower Limit Temp: Based on the lowest temperature at which a 'standard' adult man is deemed to be able to have a comfortable night's sleep.

•Extreme Temp:   A survival only rating for a 'standard' adult woman. This is an extreme survival rating only and it is not advisable to rely on this rating for general use. 

Additional thermal clothing should be worn if being exposed to temperatures in this range.

There are a number of things to consider when looking for a light weight sleeping bag.  There are many articles around on the down vs synthetic debate.  I'll leave these for you to find.  Here is a great Australian article on bags.

Temperature range

I use a 10 deg c bag which is very compact and weighs 700g for most requirements where I live. But for colder climates will require a second bag.

Waterproofing

If you are looking at wet weather a waterproof outer cover may be an advantage.  These may add cost.

This article likes the idea of a waterproof vs non waterproof Mont Nadgee for Australian conditions

Space

Most ultralight bags are mummy style and can be very restrictive. For additional comfort you may be better off in a wider and therefore heavier bag.

For a cold weather bag to try the Overland Track in Tasmania I was deciding between the a Macpac Latitude 500 XP (1.1 Kg) or Mont Nadgee (1.2 Kg), and Western Mountaineering Sycamore but ended up getting a Mountain Hardwear Spirit SL long bag s for $180 at Mountain Designs surplus at DFO, Hendra in Brisbane.  These are mummy style bags but the larger size has a bit more wriggle room.  With 800 loft down and a waterproof shell and weighing 2 lb 4 ounces (just over 1 kg) I think this is a pretty good deal. Review to follow.

Review

785 g

Macpac Express 400

Fast and light series

2 deg comfort

Size Standard

Weight 0.78kg

Fill weight 400gms

Fill power 800+ Loft

Temp rating Comfort 2ºC / Limit -4ºC / Extreme -21ºC

Comfort: 7 °C | Comfort-Limit: 3 °C | Extrem: -10 °C

Macpac Express 700

-2 deg comfort

Size Standard

Weight 0.98kg

Fill weight 600gms

Fill power 800+ Loft

Temp rating Comfort -2ºC / Limit -8ºC / Extreme -28ºC

Mountain Designs Ultra series

-7 to 3

-3 to 7

Ultra 500 989 g (Down sleeping bags)

Ultra 300 791 g

 One of the most compact -10c down bags available on the market

200 cm = 935 gms

200 cm = 960 gm