How do we prepare oddly-shaped items or items with larger dimensions than boxes (e.g., computer monitors, large sheets of blotting/filter/germination paper or membranes)?

Certain equipment, like centrifuges and pcr machines don’t need to be packed. they put them on shelves, wheel them into the truck and then secure the contents. In general, you will affix a shipping label directly to the item. The movers have various style carts and things for moving odd items.