SNES Classic Carry Case
The SNES Classic is small, but you don't want to just toss it in a backpack to take somewhere with you. Keep in mind this is hard to find in stock and you might not be able to easily find a replacement if you end up breaking it. There are a lot of cases you can use, but the PDP SNES Carrying Case is designed to fit it specifically and it looks pretty sweet.
You can choose the front of the case to show Super Mario World, Super Mario Kart, Star Fox 2, Zelda, F-Zero or Super Metroid and the case itself looks like a larger Super Nintendo.
There is a cutout for the SNES Classic, two controllers and the power adapter. You can get this at Amazon for $29.99.