There are many Luggage Wrapper in airports. So this is a common sense that at many airports you can wrap your luggage with sheets of sticky plastic. Why on earth would you do that? I only see disadvantages.

1. It's quite simple:

You can spot more easily whether someone has opened it

It can not open by accident

The luggage doesn't get dirty

You don't want your expensive luggage to be scratched!

2. Briefly:

For safety reasons, to protect your bag from scratches and liquid that could come out of other bags.

For safety reasons again, if you travel in not-so-safe destinations, airport staff might open your luggage before delivery and steal stuff.

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