I used a bedroll when I first joined the Army. It was smaller and lighter than the issued sleeping bag. It was made by stacking and rolling these things in this order:

Poncho
Space Blanket
wool blanket
poncho liner

It could be carried in different ways as it was flexible. I slept in temperatures below 20 degrees Fahrenheit with it. Not exactly toasty but functional and I could sleep.

I would have preferred slightly larger items to ensure better coverage when I was rolled up in it though.