Before you leave home there are some useful websites that you should check for travel warnings as well as checking the weather, to decide what you should pack.
Some useful websites include:
Also, don’t forget to take out travel insurance, some countries, such as the UK and Australia have reciprocal free medical services, but many others, such as the US, if you end up needing to seek medical advice can cost you thousands. Though even in Australia if you need to call an ambulance, without insurance you can be up for hundreds if not thousands of dollars.
What do you never leave home without checking first?