David,
As you are new to the forum, you may not be aware of the search feature that you can use to look for old threads on all kinds of topics.

There have been several threads in the last few weeks about sleeping bags. Try using the word bag or sleeping or both and set the time frame to 6 months and search only in the title.

There's a lot of good information already here.
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If you think you can, you can. If you think you can't, you can't. Either way, you're right.