Often we are charged in a binary system: do you have a car? Yes. Then register it and you can drive it as much as you want. Do you need luggage for your flight? Yes. OK, have 20 kg. These systems encourage us to over-use (or overpack) to match our allowances, or we feel ripped off. It could improve all of our habits and reduce our environmental footprints if we step away from these systems and lean into pay-as-you-go systems.