Top critical review
12 February 2019
According to the tag on the sleeping bag itself, it has a 14 degree "Comfort" rating, a 10 degree "Limit" rating, and a -2 degree "Extreme" rating. In other words, its intended usage range is 10 to 14 degrees. The -2 degrees is misleading. Even around 10 degrees, I woke up because of cold feet and had to wear thick socks. Having to wear thermal clothing inside a sleeping bag defeats the purpose of sleeping in one.
I have a Quechua Forclaz ultralight rated 15-20 degrees, and found that when used with a small light blanket inside, it was as warm as this Biker bag, probably warmer.
Overall, this is a decent bag in the 10-14 degree range, but the claimed temperature rating takes off two stars. Someone may believe in the -2 degree claim and end up dangerously chilled on a trek. The product description only mentions size, weight etc, and nowhere breaks down the claimed -2 to 14 degree span (i.e. clarify that 10 degrees is the "Limit" temperature and 14 degrees the "Comfort" one).
Not easy to pack; when the air is squeezed out, it slowly seeps back in through the main pocket, even if the small valve is closed.
The bag is well-made in terms of shape & material, just don't buy it if intended usage is under 10 degrees.