Expanded polystyrene is light and cheap and does not warrent the need for manual downstream handling. This is one technique for collating square trays into a matrix which is then pushed into preformed polytubing.
After the tube is end-sealed the pack is transferred to a stacking area. Thereafter the stack can be conveyed and accumulated before loading into road transport.
Odd shapes can be collated but individual consideration needs working up to justify cost effectiveness.
Video 1 - Packing Styrene