Uninsulated air mats? Will pack light and should be comfortable. The caveat is that you'll be getting virtually no insulation underneath you - the down in your bag will be compressed and so not offering much warmth.
So it could be a problem cf warmth in Spring/Autumn. Or maybe not with some foam etc under it.
If you can stretch the budget a bit there are some semi insulated air mats (less than the down ones) which would be 3 seasons fine. Depends what you're trying to do I think
Only comments I've read on the Numo were on Traksterman's blog and he seems to have binned it.
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