You can't. thats true
They gave them out when club penguin first started doing mail.
This item is not not currently available.
I KNOW EVERY CLUB PENGUIN THING ANYWAY TO GET A BLUE MAIL BAG ITS A FREE ITEM FROM JULY OF 2008 TO GET IT ITS IN A POSTCARD WITH GET ITEM ON IT
It was from a long time ago. You click on your envolope and you get one.
you might of deleted one of your mails okey
It was from like 2 years ago. I don't know if it still exists but . . . You click on your envelope in the top left corner and you see a mail bag. You click on it and you can wear it.
I'm a member, but it should work for non'sOpen your mail and you should automatically get a blue post man bag
* yOU GET A
Go to the pizza parlor and get the money bag
Jew-Pan
on club penguin what is thrown out of the truck on level 4 of bean bag
I think it's only available for a limited time only they were giving free ones away when Club penguin mail opened :L