Why ultra-light sleeping bags? Because ultra-light hiking is permitted by reducing the weight of the 'major three;' the backpack, shelter and sleeping bag. The times of five-pound summer bags are gone - at least for those folks who would rather go light.
One-pound Ultra-light Sleeping Bags
There are several one-pound ultralight sleeping bags on the market now. My own is 1-7 ounces. It really weighs 19 ounces with the stuff bag, but stuff carriers aren't always necessary. It could be stuffed into my pack or place in a half-ounce bread bag. It's a down sleeping bag, and has kept me warm down to below freezing - warmer, in-fact, than my four-pound bag used to keep me.
It seems vulnerable, and I have babied it through the years, but it may be tougher than I thought. I have employed it from sea-level to 16,000 feet, in most forms of climate, frequently camping under a tarp, nevertheless it looks almost new, and it still has its attic. To compare more, please consider having a peep at: baseball bags website. I discovered go by browsing Google Books. The freezer goes only half-way down, to save lots of weight, and it's a mummy case, but I am 6'3', 165 pounds, and I have always been comfortable in it.
Sleeping bags weighing around a pound are summer bags, rated down to 40 to 50 degrees fahrenheit. A quick check of the bags available, though, suggests that even a couple of of the 0 level bags are under three pounds now. These are down filled bags, obviously, as down is still the lightest warmth for the weight.
Another major benefit of any down sleeping bag is-it is compressibility. Nothing bags smaller than down. But, a good synthetic bag is most likely better than down if you're frequently setting it up wet.
Many sythetic-fill sleeping bags now come close to down in their warmth-to-weight ratio. At least one summer bag, using Polarguard fill, weighs an even 16 ounces. That's extremely light for a case.
Using Ultralight Sleeping Bags
Ultralight asleep bags generally speaking are not hard. This unusual bat bags use with has a myriad of salient cautions for where to study this idea. The brighter the bag, the more fragile, but treat them gently, and they work fine. I have used mine for many years, in rain and snow, from Ecuador to California to Michigan, and it shows little use. Baby these things, and they could last a long time..