Marineland Rite-Size Z Filter Cartridges: Need Dimensions!!!

I use something like this for the poly batting

Does batting need containment? If so in what?
 
cheap as in good or bad? I found some $6-7 ones too... I just thought if it was enough... why pay it? And I definitely wouldn't replace!
Inexpensive, I think I have Fluval, they last forever. You only have 5 gallons, I have 125. I probably have 2 or 3 cups of rings.
 
Comparing the batting to floss. Do you cut a rectangle slightly shorter than the cartridge so there is room for the rings on top? Trying to figure out batting vs floss
Cut the batting so it lays horizontally flat on top of the bio-foam. I use 2-4 layers. You can also cut a longer piece and fold in half to save cutting. You then place the rings on top of the batting which will hold it in place.
 
A rough sketch, batting is yellow, bio-foam black

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