Shipping torsion bars

Small diameter, I use the cardboard tube from a roll of carpet, - larger diameter, I use "Sono-tube" that's used to pour a concrete pillar in different diameters.
The tubes may cost more(?), but they are near impossible for a delivery ape to damage.
Being round, they generally get stuck in a corner, or on the top of the pile.
Dashboards, dashcaps, tail panels, are well protected in a tube .
I use a coupla pieces of plywood screwed together, for end plugs, screwed thru the side of tube.
No complaints ! !