I guess they weight round about 1 kg, pack relatively compact, are rated till 10*C and survive only 200 nights of use.
Small persons could use two of them pulled in each other as winter sleeping bags around 0*C.
For this use I would buy two with the zipper at the same side.
I don't know them, I don't own them, I have just seen them.
We discussed about them one year ago in a german bushcraft forum and came to the result, that they are a good solution for beginners who are currently on a low budged and want to start with bushcraft this summer.
Small persons could use two of them pulled in each other as winter sleeping bags around 0*C.
For this use I would buy two with the zipper at the same side.
I don't know them, I don't own them, I have just seen them.
We discussed about them one year ago in a german bushcraft forum and came to the result, that they are a good solution for beginners who are currently on a low budged and want to start with bushcraft this summer.