If you are on your period while traveling, it can be annoying anywhere. Imagine being on your period and not having any public bathrooms anywhere? You might come across a filthy porta-potty, if you're "lucky". You have to pay to access a bathroom? Welcome to downtown Amsterdam ;) It was nice to get to Germany after that -- I never thought I would appreciate having free bathroom access!
I wish I had known about period underwear sooner in my life. You do not have to stress about changing cotton products throughout the day. No worries about cups leaking. They have been amazing for work, travel, life.