Hey, I slept 3 months in a hammock on a ship and we just hung the hammocks as tight as possible so that we could lie quite flat and had matrasses made of small pieces of crushed cork, then just a woolen blanket on top.. Worked very well and slept good, 3 months and a half without a night on a bed. The matrasses were only big enough to be under the body, not under the legs, where it wasnt really needed.
Then later I tried camping in a MK hammock, with the sleeping bag all around it. Worked ok, I have a rectangular sleeping bag, quite big, I just put a sweater at my feet to stop air, and at my chest..
I tried the reflective mat, was warm in it, but it doesn last long, and sometimes it was just sliding around, didn like it much..
Never tried bivi with matress..
Ie now used the underblanket a lot, I think itś really comfortable and love it. I have quite many times slept in it with my girlfriend. We only needed to take one hammock and one blanket (sleeping bag) for on top of us, one tarp, one mosquitonet... So it saves a lot of space n weight to do like this. And we sleep good. Sleeping with two in a hammock can only be done when using an underblanket I think.. But then again not many people do that.. Well, I definately get the point that the underblanket is expensive.. and if sleeping on a reindeer hide or on a normal camping mat works for you itś probably much better as you can opt to sleep on the ground if you want to. The underblanket is just real luxuoury. And I actually like that when Ive been out all day
