If you curb check a car seat...

[andthentherewere10]

I put mine in a nylon laundry bag, so yes

[zeewifeandmama]

Should be fine. They once gave us big clear plastic bags when we forgot our carseat bags.

[mannah]

Yes you can put it in any bag you want including a garbage bag or just check it with no bag which is what we've done a few times.

[Jalapeñomel]

I put it in one of the large Amazon gift bags that I got from baby gifts.