A couple years ago I upgraded my down sleeping bag. I removed most of the older 850 fill duck down and replaced with premium 950 fill goose down. Major upgrade and I love it. But the main problem is, sleeping bags are not as versatile as quilts and down requires more attention. Synthetic on the other hand is cheaper and very easy to work with. It also performs better than down in wet condition. Nevertheless it is really heavier and bulkier but this is not a problem for camping. So I decided to make one and I am very satisfied with the results. We will see how it performs in real condition but so far it looks fine. Final product: And a few pictures of the process.