Western Mountaineering Alpinlite Sleeping Bag: 20 Degree Down

This is a premium bag. It's a mummy bag, but it's wider than a traditional mummy... which is great for those of us that like to move around while sleeping. It's very warm however, and has some cool features. It has excellent loft and compresses nicely. I have a full video review at backpackersreview.com

This bag has every right to be big, bulky and heavy...but it's not! This is the bag that I use the most. 20 degrees keeps me comfortable 3 seasons in the mountains and during spring and fall in the desert. I've never found a 20 degree bag that lofts as tall as this one. It's roomy for my stout stature yet weighs a scant 2 lbs. The stuff size is slightly greater than a football. Although this is made from Western's least water resistant shell, I awoke in the Cirque of the Towers one morning in Sept. to 24 degrees and 4 inches of snow covering me in my Alpinlite. (The stars were out when I went to bed. Why would I pitch the tent!)The bag was dry. I was warm. Just rolled over and went back to sleep.
If you're an ultralite fanatic and want to save another 1/2 lb., get the Ultralite. While you're wrapped tight in your 1 lb. 8 oz. bag, I'll be makin' babies in mine.

I absolutely love this bag and would have kept it if I was bigger. I was initially torn between the Ultralite and Alpinlite, and ended up with getting the Alpinlite first. After some time in that bag I just found there to be too much dead air from the extra girth, but the Ultralite was snug to the point where I was worried about down compression if I had layers on. I returned the Alpinlite for the Versalite since it fit more snugly and rolled with me when I slept.

While the Versalite is slightly warmer than the Alpinlite or Ultralite bags, the chest girth sizing falls between the Alpinlite and Ultralite, which was perfect for me. The full length zipper allow for easy venting and I have no worries of overheating—I generally sleep very warm. The Versalite also comes with one more ounce of down than the Alpinlite, but is slightly narrower and thus warmer overall and spans a wider degree range. The full length zipper also allows the bag to be opened up and used like a quilt in warmer weather. I have taken both bags down to low 20s and the high teens and slept comfortably in a baselayer with the neck baffle completely loosened in the Versalite. The Alpinlite required me to cinch down both to trap in heat to fill the dead space.

The materials are top notch, the down is super lofty—WM bags are great.

Only used it twice but I love the fit. I'm 5'-2" and the bag fits perfectly with some room to spare for extra layers at the bottom.
My first trial was at the base of Mt Washington and the outside temp had dropped into the low 30s. I was cold with my base layers on but I run cold.
The second trial was in VT and the outside temp was in the 50s and damp. I was a bit too warm in the base layers on but boxers & undershirt was just right.
The only downside I experienced with the bag is the smell it gives off in damp conditions. The down smell can be a bit much even if the bag isn't directly wet.
Overall love the bag!

Used for the first time. Very light-weight and obviously very high quality bag. Unfortunately the temperature was between 50-60f degrees and I was too hot. I finally got comfortable around 4 am with the bag unzipped all the way. I think when I get to higher altitude, or the temp drops to around 30-40f it will be perfect.

i've been hiking 2 to 3 times a yr for the last 20+ yrs and i have finally found the bag i'll use for the next 20. this is probably the 8th bag i've owned ( 1st down ). I.m 6'1" and 215 lbs and i never feel restricted in this bag. i used it down to 30 deg with just a light base layer on. no cold spots. great workmanship ( made in usa ). just buy it !!!!!

Finally a warm and light sleeping bag for big guys that doesn't fit like a condom. Field tested it this autumn in the Dolomites in Italy in open air around freezing temperatures. Didn't need long underwear to keep comfie. Great product, fully worth the price.