I need to add a few more things to my registry, so I am thinking of adding some car/car seat accessories, but I don't want to add things that aren't going to get used or will be a waste.

I am thinking
--mirror (the ones that you put on the headrest)
--sun shade
--seat protector that you put under the car seat

Did anyone find these either very helpful or totally useless/unnecessary? Feel free to suggest other accessories that I haven't thought of!