sealed

An envelope whose flap has been glued down to secure its contents.

A glass or ceramic jar with a tight-fitting lid, often for preserving food.

A container that is closed tightly to be airtight or prevent leakage.

A cover for the top of a container that has been fastened securely.

A legal or official order that is kept secret from the public or certain parties involved.

A tube, often used in scientific experiments or for packaging, that has been closed at both ends.

Refers to a formal, confidential offer, typically in procurement or auctions, submitted in a sealed envelope.