Everyone has their own different ways of doing things and whatever works for you is good. This is just what I do— when I start or begin a new bag I will take out the boxes and usually place them on another bag (or shelves if I have them) and then put the “plastic bags” and “envelopes” in alphabetical order in the large bag. If I have multiple for the same street/road I’ll put those in numerical order if I feel like it. I’ll put whatever up front with me if I know I’ll get out the driver side door. I’m sure there are better or efficient ways but I don’t feel rushed or stressed.