I have pattern boxes.. They hold a pretty good bit of patterns. I bought mine at Hancock Fabrics.they were $2.00 . They are cardboard, and you can write the pattern numbers,names,etc on the outside of the box. I have several of them, So I can sort patterns by sizes, types,etc. Works great for me.
and...I recyled a washing powder box [the big ones with the handles. 80 wash load size.].I painted it , inside and out.. Decopodged pretty paper, ribbons, buttons ,etc and it was really pretty.. Patterns fit perfect in it. exact size of the patterns.. This box sits out in my sewing room, and holds the newest patterns...that I am intending on working on.
Hope you find a solution.. Happy Sewing, Judy
Judy posted a similar discussion awhile back called "How to Put Away Patterns" there were some good ideas there. I can't work out how to link back to it, but if you put "put away patterns" in the search bar it will pop up quickly.