Can I freeze a Bundt cake and have it still be good when thawed 3 weeks later? How would I wrap it for the freezer?
TIA

Wrap it tightly with several layers of plastic wrap... no air! To thaw, put it on the counter and do not unwrap it until it is completely thawed.

Should I wrap the plastic around the ring, so that every surface of the cake is covered? Or can I just wrap the plastic around the cake as a whole, which would leave a pocket if air in the middle? Does it matter?

You could wad up some plastic wrap and put it in the middle, then wrap it. You sound just as OCD as I am with my cakes!

I would wrap the *ring part of the cake* ensuring that every inch is covered in glad wrap / saran wrap.
Any gaps in the wrap can cause moisture to settle - and can cause freezer burn to the cake.

Then wrap as scp1127 said - and all will be fine for you.
Agree - allow to thaw still wrapt - that way your cake will not dry out whilst defrosting



Off Topic - good grief - this is about the 3rd time i have agreed with scp in less than a week -
Next thing you all know we will be caking buddies -


Blue.

I think there is only one thing we don't agree on. That's not too bad.