Meaning:

“中” means “middle,” “古” means “ancient,” and “包” means “bag.” A term originating in Japanese, it refers to “second-hand bags,” especially of luxury brands. Some limited-edition second-hand luxury bags can be even more expensive than when they were first bought in.

Example:

A: 你姐现在干什么工作？

Nǐjiě xiànzài gàn shénme gōngzuò？

What does your elder sister do for a living?

B: 她开了个网店卖中古包。

Tā kāi le ge wǎngdiàn mài zhōnggǔbāo。

She runs an online shop selling second-hand luxury bags.