Protect your luggage
You cannot predict the weather when traveling. You can protect yourself with an umbrella and a raincoat, but your luggage is not waterproof. If you get stuck in the rain with your suitcase, your belongings inside it could get damaged.
To avoid this, buy a waterproof bag or a plastic covering to put on it. If you’re traveling to rainy cities like London, getting wet is inevitable. So the contents of the bag don’t get soaked, but a rain coat on your suitcase.