I have a portable monitor and miniPC with a wireless keyboard and mouse. Kinda like this but only a single monitor. I only need 2 cables: 1 for miniPC power, and 1 usb4 (looks like usbc) which is both power and display for monitor.

If I really wanted to be "portable", I could technically keep a powerbank in my backpack to plug into. I don't really care because even laptops have like 1 hour battery life and need to charge all the time. Upside of this setup is that it's more powerful and doesn't overheat. I do this because I travel sometimes and want a temporary pc.