What type of paper should I use for print outs for a physical portfolio?

I'm creating a physical portfolio for an interview. I've bought a portfolio binder/case. I was wondering on what kind of paper should I take the print outs of my work? For example, would it be fine if I used the regular paper? Like an A4 size or should I use a matte or glossed paper for my work? My work includes posters, brochures, business cards etc.