Rating: 5 / 5
I have used this bag for a four-day and a three-day trip in the White Mountains(NH) over the last month. Temps varied from 26-52 degrees F. The bag is rated for 40F. I was definitely chilled when the temp dropped into the 30s, but that is below the bags rating. Above 40, the bag does its job well. The bag doesn't look that stuffed with down, and it is not really a three season bag, but as a summer bag, it is simply excellent.
It only weighs one friggen'pound--amazing!--on my scale and is so compact that I carried it in its cotton storage bag rather than in its included stuff sack.
Like most of the newer Montbell bags, this is a roomy bag. I'm a big guy--210lbs--side-sleeper and roller-arounder, and there was plenty of room. The hood fits well and the zipper works nicely. The fabric is light, but appears less fragile than some of the other(WM) bags I looked at. The fabric has the excellent Polkatex DWR, which does a fine job of keeping morning dew away from down. The construction appears to be very high quality.
I highly recommend this bag if you know the temp won't drop below 40F or if you are willing to wear your puffy top and longies to bed. I am consistently impressed with the thoughtfulness, advanced materials, and construction of Montbell products. And I am still amazed that I have gone from my old 2 1/2 lb summer bag to one that weighs all of 16 ounces.