I have all mine neatly boxed up in old large Quaker Oats boxes, two boxes per whatever I can get in them, with a sticky label on the front giving details of first and last in the series. From memory, I started in the 1980's with ME (stopped in either the 1990's or the 2000's), I have all the WME copies, and all the MEW copies. In addition, I have made a digital database of any item which may possibly be of use. Currently I have 2500 entries, each entry giving date, issue, page, main & subsidiary title, series or not, and a brief description, which may also include comments from other people, eg letters. This means that I can, depending on the query, look up to see if I have a database entry about the query and then retrieve the appropriate copy(ies).
In addition, I have scanned all items which may have an immediate interest, eg our editor's modifications to the X2 mill, so I can print it out at will.
In respect of ME, I have removed all pure advertising pages, and that makes them somewhat thinner. MEW doesn't seem to allow the same.
Peter G. Shaw