roping and sheeting

I pick up this 20yd bin every 4 weeks it’s all off cuts of new Formica and similar types of materials
If I don’t sheet and rope it whilst it’s on the deck the majority of it would slide off and fall off when I pick it up
I just wondered what advice Mr CF would give me in the art of load restraint in doing it another way
The elastic bungee on the sheet is only there for keeping it in place and not for load restraint