Dell boxes, each 21"x21"x12"

five inserts fit in each box (each box originally ships with just two, on either side of the computer)

two stacks of two styrofoam pieces, with a fifth one on its side in between the stacks

extra padding was around the middle insert (I used some 'air pad' strips I had on hand, but wads of more plastic sacks would work too)

one of the stacks of two inserts

five insulators fit in each insert (5 insulators per insert, 5 inserts per box, equals 25 insulators per box)

bottom view (a full insert can be picked up by grabbing where the middle tabs are, and the skirts of the insulators hold them in place)

one set of insulators unwrapped (smaller ones such as tolls and ponies fit best on the ends; and larger ones - 145, 154, 162, etc - fit best upside-down in the middle)

the domes of the middle three insulators stick out through the slot

what the empty styrofoam packing inserts look like

one way the styrofoam pieces can interlock

the other way they can interlock