For camping/backpacking (no cycle touring yet) I've used a 30 degree down mummy bag, a Hudson Bay wool blanket, a 55 degree poly fill travel bag, a homemade 45 degree poly quilt, and two cottage-gear-maker backpacking quilts: one 40 degrees and one 30 degrees.

All except the 30 degree quilt open out flat and that item just has a footbox built in. I hate sleeping in a bag, I like to have my arms and legs free to flop around where they will.
The wool blanket weighs far too much and not as warm feeling as any of the others. However, it will not melt when using it around a campfire. It stays home since it is unless I go car camping and want to be all cool and retro.
I rarely use the mummy bag anymore since the 30 degree quilt is warmer and compresses to a smaller package (higher quality down fill) and weighs slightly less since it does not have to completely enclose me as the mummy does and does not have the never-used zipper.
I've slept under the 40 degree down quilt (with extra clothes) to 31 degrees.
The home made poly quilt is OK, but it does not compress very well so it stays home. It is also heavier than comparable down items for the amount of insulation (how cold can I go) it provides.
The 55 degree poly bag unzips into a quilt-like item. It is perfect for central valley (california) summers.

I would suggest a backpacking quilt, a fully unzippable sleeping bag, or a woobie. All of those items will compress nicely: better than a comparably warm wool or fleece blanket. Down or poly is up to you. I prefer down since it "feels" warmer to me than poly. All in my head, I know!
Don't forget to insulate yourself from the ground as well!