Not the pirate and island kind we usually associate with the word. But the things you would grab from your 'hypothetically' burning home before you ran out of the door. They can only be what you can carry in two hands, or in your pockets; things that won't slow you down or hinder your escape. Things that will comfort you when you realise you have lost everything else.
Let's not include people or pets; let's take it as a given that everyone you love is safe.
So, you have less that two minutes before you have to be out of that door. What calls to you?
They can be real things, or they can be invented or imaginary. They can be concrete or abstract. What matters is not factual accuracy but emotional truth. We must make our readers FEEL that it IS true.