Hi everyone and anyone ^_^x

I have a question i would like to ask those who 
have a lot of genga and douga. I just recently 
was able to acquire some douga, and im not sure 
how i should store them. The cels are easy, i put 
them in a plastic sheet and then into a itoya 
book along with the matching sketch if it has 
one. Im not sure if I should do that for the 
douga since they all arrived in one plastic 
sheet. The douga appear to be rough sketches of a 
character scene.

How do you store your douga? Since douga can 
potentially out number cels.

Thanks again for taking time to read this.
Happy Lainning!