When it comes to computers you've got a lot of options. I'm a big fan of Macs and its what I use. Macs are great but expensive so I'll suggest a Chromebook.
It's under $300 which won't break the bank, has enough ram (2GB) to do basic things but not enough to play games, 32GB SSD will have fast read and write times and things stored on it will load faster, has 2 usb ports one of which is usb 3.0 which is GREAT and it'll charge stuff fast and any file transfers from a thumb drive to the computer will be lightning fast. It's also got a touch screen if you're into that kind of thing. The only real con with it is that it has no disk drive but that's the way most laptops are heading nowadays. It's small and light and can easily be tossed in a bag when you travel and it'll do everything you mentioned. Picking out computers can be hard since theres so many out there. Hope this helps!