It's great that you're preparing for a digital nomad lifestyle! Many digital nomads favor online banks or fintech solutions for their flexibility and low fees. Wise (formerly TransferWise) is a popular choice for international transactions due to its competitive exchange rates and low fees. Revolut is another option, known for ease of currency exchange and a user-friendly app. Both are also making strides in sustainability.
If you're open to options with physical branches, consider HSBC's international accounts, especially if you might need to visit a branch occasionally. As for sustainability, some banks, like Triodos, focus on ethical banking, although they might not offer the same degree of flexibility for travelers.
It's important to check the specific services and fees associated with each bank, as they can vary depending on your country of residence. Consider how often you’ll be making international payments or currency exchanges to weigh those factors appropriately.
Have you considered any particular banks or services yourself? It might help to compare a few based on features that matter most to you.