Originally Posted by Pipsissewa
I know duck down is not as warm as goose down, but heck! For $10, I'd give it a try too!
Interestingly, when I was researching down for my DIY stuff, I called up a down manufacturer and asked about the difference in warmth between goose and duck. Even though they sold both kinds (and goose at a substantially higher price) they told me that there was no noticeable difference in insulation value for a given loft, and recommended I go with the duck down as I didn't need 850+FP down for my project when 750FP or 800FP would do.