How should I keep my unframed A3 size pencil drawings? Just to protect my drawings from dust and smudging them, I used to keep my A4 size drawings in a office file like this.



Now, I've started drawing on A3 sized papers, and I don't know where to keep them. Shall I go with a similar file that I used to use, with a larger dimension, or is there some special file for keeping artworks? And how can I Google it (I tried, but found only office files).
A3 Drawings Briefcase



Google search link