Another suggestion on using the Brodart archival covers is that they offer an assorted package of 3 different sizes: Brodart Just-A-Fold III Archival-Quality
or an assortment of 5 sizes called Brodart Fold-On Archival Quality also on the same page.
While buying them this way is a little more expensive I find it convenient having the different sizes available. Then when I determined which sizes I needed the most I purchased the precut boxes of 25 or more.
The rolls are cheaper and have less waste with the advantage they can be cut to any length for odd length dust covers. However I like the ease and convenience of the precut. Very seldom are they not long enough for the DJ. Most often it is with the taller (10" or 12") covers so those I buy in the L (2" longer) size.
Also I think the precut would be easier to work with - the cardboard container they give you free (Request: #10-BJC-BOX) makes it easier to pull them out and store. Also I prefer the Just-A-Fold III style but the Fold-On Archival style is another choice.
Bottom line is as others have said - the Brodart covers are excellent. Hope this helps.