I think the starting point should be to consider how long it will take to walk/get home, and the weather and other conditions along the way.

In my neighborhood, we have folks that commute 20+ miles one way to downtown Washington DC, and others that work in Annapolis, just 7 miles away.

Assume they are walking home, each are going to need different bags with different contents.

Age and physical fitness also needs to be considered: 40 years ago I could and did walk 20 miles in one day. Now, not so much. . .