Trash Can + 2 Rolls of Trash Bags Organizer

The reason your car is messy isn't you. It's that there's nowhere to put anything.

A proper lidded bin that sits where you can reach it without looking, so the wrapper goes in the moment it's in your hand instead of "later". The lid is the bit that matters, keeping smells in and stopping everything from redecorating your footwell on the first sharp corner.