There are many packing list posts and they usually end up being quite long. There are many opinions on what is required and what isn't.
If you click on "Search" and do a search on "Packing List" you will come up with many ideas.
Note: Click the "Search all Forums" button.
However: If anyone would like to add their ideas for essential items, feel free to post it.
I am of the opinion that the only things you HAVE TO HAVE are: Money, credit card, valid ID, Medication and a reservation. Everything else can be purchased.