Nintendo Switch Silicone Cover
If you want something that's easy to put on and just as easy to take off your console, buy the Nintendo Switch Silicone Cover.
It's a whole console cover. Dock your Nintendo Switch Joy-Con controllers to the side of your console and slip this cover over everything. Drop your device and this cover will protect its plastic shell from scratches. It will save your display from shattering if you drop it from a medium height too. Cutouts allow the Nintendo Switch to breath, and you can still access its charging port, headset jack and Game Card slot.
Amazon has the Nintendo Switch Silicone Cover in red, blue and clear for $8.50.