This is my check-in luggage.

这是我的托运行李。

youdao

"If people are trying to smuggle live tigers in their check-in luggage, they obviously think wildlife smuggling is something easy to get away with and do not fear reprimand," he said.

“如果人们想在他们的托运行李中偷运老虎，他们显然以为私带野生动物很容易一走了之并且不怕受到谴责，”他说。

youdao

Passengers with hand luggage can go straight to the departure gate to check in there.

携带手提行李的乘客可以直接到登机口办理登机手续。

《柯林斯英汉双解大词典》

Air travel has become increasingly annoying and enervating: delayed flights, more restrictive rules on the size of carry-ons (anything bigger than a wallet may force a gate check), delayed or lost luggage, long check-in lines, etc.

FORBES: Fact and Comment

Airport curbside luggage check-in will no longer be allowed.

CNN: Flights still grounded amid security concerns

But what are the airlines communicating with their baggage fees at the check-in point if you want your luggage checked through so that you no longer have to carry it?

FORBES: Avoiding Passenger Congestion