The 13.3-inch 1080p screen is best suited for 13- or 14-inch laptops, and it's not a screen I'd rely on for color correction, but it's great for leaving apps like Slack and another browser window for two-screen productivity. Just connect the included USB-C to USB-C cable and you're good to go. Voilà! You have a second screen that doesn't take up any desk space. Pop the Duex Plus on the magnets and slide out the display so that it floats to the side of your laptop. These are easy to install with the included assembly instructions. It sticks to the back of a laptop screen via magnets, which means you do need to be comfortable with sticking and leaving adhesive magnets on the back of your machine.
This is by far my favorite portable display.
Mobile Pixels Duex Plus Portable Slide-Out Monitor for $299