This may be classified as either checked baggage or hand (carry on) baggage.
You can drop your baggage at a KQ drop-off point at the respective airports where we have online check in. See List of Airports

Baggage should be dropped at least 1 hour before your departure for domestic flights and at least 2 hours for Intercontinental flights.

If you are traveling with carry on luggage only, you can go directly to the boarding gate before the time limit for boarding printed on your boarding pass.
You are required to be at the boarding gate 45 minutes before departure for domestic flights and 1 hour before departure for international flights.
If you do not present yourself by this deadline, your seat will no longer be guaranteed.

For information on baggage weight limit and hand baggage information, please visit our website