Can airport security open your luggage without you present at Nha Trang airport?

If security has questions about your bag, they make a PA announcement. If you don't show up, they open the luggage without you. Always listen for your name over the intercom.

At any checkpoint, staff may ask you to open your suitcase. If you're confident nothing inside will raise questions, you can wrap or pack your bag at the hotel before heading to the airport.

All checked and carry-on bags go through X-ray. If something looks suspicious, you're called over. If you don't respond, prohibited items are confiscated and a notice is left in the bag. Don't pack beer in hand luggage — buy it airside after security, even if it costs more.