Add lists which automatically get selected if all the lists they reference are selected. These could be differentiated using the category system if they're in a category called 'auto'. E.g.
Rave
Water bottle
Fan
Multi-day
Toothbrush
Toothpaste
Rave recovery:auto
~Rave
~Multi-day
Painkillers
If both rave and multi-day were selected, the "rave recovery" list would automatically select and painkillers would be added to the final packing checklist
Add lists which automatically get selected if all the lists they reference are selected. These could be differentiated using the category system if they're in a category called 'auto'. E.g.
If both rave and multi-day were selected, the "rave recovery" list would automatically select and painkillers would be added to the final packing checklist