Can i send a letter that's puffy in a normal white envelope at the postal office?

i'm sending a letter to my friend and i'm also giving her a small puffy felt key chain in a normal white envelope. it's not that puffy and i'm still able to close the tab, can i still mail it if it's puffy? or do i need to buy the other small shipping envelope??Can i send a letter that's puffy in a normal white envelope at the postal office?
you can but it will probably get destroyed as it runs through the conveyor processorCan i send a letter that's puffy in a normal white envelope at the postal office?
You should buy a padded envelope to send it in. The paper of a regular envelope might not be strong enough.Can i send a letter that's puffy in a normal white envelope at the postal office?
I wonder if "if it fits it ships" applies to this one.
Yes

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