Washing a down sleeping bag with a duct tape patch

If it was me I would wash it by hand in the bath tub.

I've actually done the same with electrical tape. I forgot it was on there and washed it. It held up fine so ive kept it.

Edit – note I did not run it through the dryer so YMMV!

You could always stitch around the edges of the duct tape, making it a more permanent patch not completely reliant on the adhesive.

There are rip-stop nylon patch kits for $2 that have adhesive on the back that have worked well for me, but also are better when backed up with some stitching. Also, one of those colors is probably a better color-match to your sleeping bag. Round the corners before removing the backing so you have a oval or rectangle with rounded corners with no sharp corners.

Interesting conundrum.
To fix the patch the bag needs to be cleaned, however cleaning the bag might just dislodge the patch.

If it were my bag I would gather the patch to a point and put a rubber band around it ,

then wash it by hand in the bathtub (or laundry sink ) .
Just make sure you use pure soap (pure soap flakes (diluted…) or "down wash") , rinse very well, several times, and don't lift it out by hand but use a laundry basket (slid it in) or the cotton bag it comes with.
This is of course theory because I have washed several down bags but not with a patch…

I'd do like Franco suggests. Why not have WM fix their own bag? Rainy Pass cheaper or more convenient? You'd still have to clean it, just curious.

It will get through the wash okay, but might not make it through the drying. The rubber band idea looks great, just make sure your rubber band only grabs fabric and not any of the down.

Thanks for the suggestions, everyone. I'm leaning towards stitching on some tenacious tape or the like to get through the cleaning and then a professional repair after that. I will post an update after (which will probably be a picture of me covered in wet down).

No experience with washing a down bag with a duct tape patch on it, but I've washed and dried several other items that have tenacious tape patches on them (wind pants, down jacket, synthetic fill jacket, etc.) and they've all made it through the front loading washer and dryer no worse for the wear.

I was careful to make sure I got a good seal between the repair tape and the material and cut the tape patch such that it had a decent amount of overlap beyond the tear (~1/2") and all corners were rounded.

Thanks for the tips everyone. After posting, I remembered that my bag and its duct tape patch have been in the dryer several times already to fluff up the down or dry it after a wet trip.

Knowing that it had already survived a few trips through the dryer, I decided to hand-wash the bag in the bathtub and then just toss in in the dryer on low heat with tennis balls. It came out just fine–the duct tape did not come loose at all.

Hooray for duct tape!

I was gonna say, the duct tape will hold fine, through repeated washings. I have a FF Vireo with a duct tape patch that carried on fine for nearly 10 years until I finally sent it back to FF for repair.