I used just one large box ((80W x 64H x 23D cm), but this table could also of course be made from multiple boxes or pieces of cardboard.
This particular box was made from 3-ply cardboard
which is quite heavy duty (7.5 mm thick). Doubled up it was 1.5 cm thick.
If you are using thinner cardboard (e.g. single layer type), I would recommend using at least 3 layers so it has some strength.
*For the legs, make sure the corrugated "flutes" are vertical (if they are horizontal it can collapse easily).
In the first illustration (front of the box) you can see two tabs at the bottom of both leg pieces.
The tabs will fit into holes in the bottom of the table top, like a mortise and tenon system (see the second illustration, shows the table top, with holes for the tabs). *I did not cut out the holes for the tabs until immediately before assembling.
The horizontal support piece slots into both legs.
You can adjust the length and width of pieces to accommodate the box or cardboard pieces you have available.