sealed envelope

Translations
запечатанный конверт
He handed her a sealed envelope.
Он передал ей запечатанный конверт.
Definitions
A sealed envelope is a closed envelope that has been secured to prevent it from being opened without breaking the seal, often used to ensure the confidentiality and integrity of the contents inside.
Words
sealed

adjective
запечатанный
envelope

noun
конверт