I have used lightweight sewin interfacing for patterns. If they are small, why not trace them all on to one piece? Not forgetting to label them so you know what you made them for - I am the proud owner of some unattributed draftings. When it's an FBA piece I try to write on the pattern I started from, the size and the date. Then put them into a ziplock bag with the original pattern. What do you use to store yours?