It's a bundle.
err
Grammatically correct but illogical. We expect the package to include the letter, not the letter to include the package.
blunge, bungle
To send a letter or package by priority mail, the package or letter must be taken to the Post Office. There is paperwork to fill out and determine the date that package or letter needs to arrive.
envelope
It is the sender of a letter or package's address. It is used just in case the letter or package that is sent does not reach it's destination it can be sent back to the sender.
Envelope
you can use bubble wrap :)
An unusual odor, such as a strange chemical smell, could be a possible indicator of a suspicious letter or package. Other signs include excessive postage, misspelled words or addresses, and unexpected or unfamiliar senders.
package, massage, passage
envelope
it is a envelope.