If you're visiting more than one country on your trip, this is an important distinction to understand before you purchase.
If you buy a regional plan (e.g. "Europe" or "Asia-Pacific"), you can use the same eSIM across all countries included in that region. Your data allowance is shared across all covered countries — no need to swap eSIMs at each border.
If you buy a country-specific plan (e.g. "Japan 5GB"), it will only work in that country. If you travel to another country, you'll need a separate eSIM for that destination.
If you're visiting several countries in one trip, a regional plan is usually the best option. It saves you the hassle of buying and managing multiple eSIMs, and you get one shared data pool across all your stops.
Check onroamly.com/explore for available regional plans and the countries they cover.