Keeping your energy consumption low is the smartest move for any extended stay in the wild, and having your entertainment stored on a physical disk is the best way to do that. Most modern platforms are designed to fail the moment you lose your data link, which makes them completely useless for real field work. You should search for a web-based service that lets you save files in a standard format that any basic player can handle. I usually organize my field drives by subject so I can find exactly what I want to listen to without wasting any screen time. It makes the isolation much more manageable when you have a solid library of content that doesn't depend on a distant server or a monthly payment