A waterproof sleeping bag?
That would require a waterproof outer layer, a zipper that was completely waterproof, and the zipper would have to zip all the way closed.
Are you trying to keep water out when it's packed in your boat or while you are actually sleeping in it?
If you are reasonably sure the bag is going to get wet, a synthetic bag makes sense. But at some point you might be better off just using trash bags to keep the rain off the bag (stowed or while sleeping).
Full Size Sail Rig
Kindle / iPad Cases
Rescue / Throw Bags
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