Rating: 5 / 5
I have always been a fan of zipperless sleeping bags, having owned an old Sierra designs moonlight which was fantastic until I regretfully sold it, I was definitley in the market looking for another zipperless sleeping bag.
Thus, the TNF propel 05' model (no zippered foot) was definitely the answer I needed for a lightweight no fuss sleeping bag for warm weather climbing trips and backpacking trips.
As in terms of warmth the rating of the bag of 40F could be accurate if one was a very warm sleeper. I consider myself a 'normal sleeper', and 45F-50F rating seems to be a bit more reasonable. (sleeping in shorts)
However, when supplemented with a bivy , thermals, wool socks, a warm jacket and beanie, the sack has been taken down to the low 40's with relative comfort.
The beauty of this bag that sold me was the simplicity, the welded insulation ( almost no cold spots), and color (dark grey).
The only quibble I have, is the bag is tad large, better suited for someone closer to 6 feet tall and on of a slightly larger build. Nonetheless, the bag can be maniulated to fit comfortably, and has been a fantastic bag overall.