Originally Posted by
Lux Flyer
Prepaid bags will auto refund after the flight if not used to check a bag. If they don’t you can request it on united.com/refunds; theoretixally you could also request the refund in advance, I suppose.
Good to know! I know this is a UA forum, but which other airlines have that policy? I always intentionally estimate low on prepaid bags because I don't want to pay the fee and then lose that money, but it would be nice not to have to worry about that.