плик in English:

I opened the envelope and pulled out a letter.

He opened the envelope only to be disappointed.

I addressed the envelope containing the invitation.

The secretary inserted the letter in the envelope.

I need an envelope, a piece of paper, and a pencil or a pen.

addressed envelope

An office girl was robbed of an envelope containing 100,000 yen on her way back from the bank.

Please include a self-addressed, stamped envelope with your submission.

Notaries are involved in the drawing up of notarial deeds and sealed envelope deeds.

Enclose your resume in this envelope and submit it to the personnel department.

It might be a bit big but this envelope will do just fine. It's better to be too big than too small.

I need an envelope and a stamp. You have to fold a letter before you put it into the envelope.

I stuck a pretty stamp with a flower on it on the envelope before posting it.

Well, sometimes you need to push the envelope.

You have to open the envelope carefully so as not to damage the cheque.