Much about life today is rushed, and almost uncompromising. The more we take care of those things immediately in front and within our influence, the more trouble or stress will be lessened. What the road doesn't need are anxious and distracted drivers. That said, your car serves many duties. The more that needs doing is equivalent to what could go wrong even while running errands daily. What all drivers need is to benefit from organizing what can be organized in the rear and adjacent. And, that's easy.
When stowing groceries or shopping parcels, and whatever you're transporting, make sure everything has a "home." Dividing items, keeping them snug and flush against floor, seats or side panels will ensure nothing comes loose and mobile, and thus distracting or dangerous to driver. Be mindful of what should fit, what doesn't. And, never compromise your view through mirrors or back window.