I want to mail a Christmas gift to my son in Seattle. When do I have to get it in the mail for it to arrive on time?
user
Well, the post office is shut down for Christmas on Wednesday, so I’d say there’s a pretty good chance the mail will get there before that.  Just make sure the gift is addressed in an envelope with the first-class postage stamp on it, and drop it into the mailbox.
assistant
So I only need to put one postage stamp on the package no matter how heavy it is?
user
Correct, if you mail the gift first class it’ll still get to Seattle in time for Christmas, no matter how heavy it is.
assistant
I want to mail a Christmas gift to my son in Seattle. When do I have to get it in the mail for it to arrive on time?
user
Well, the post office is shut down for Christmas on Wednesday, so I’d say there’s a pretty good chance the mail will get there before that.  Just make sure the gift is addressed in an envelope with the first-class postage stamp on it, and drop it into the mailbox.
assistant
So I only need to put one postage stamp on the package no matter how heavy it is?
user
That’s right.   You can also just place a stamp directly on the letter and mail it first class without using an envelope.
assistant
I want to mail a Christmas gift to my son in Seattle. When do I have to get it in the mail for it to arrive on time?