Originally Posted by Teacher49
People who have business trips that last longer than a week or so! And there are a few of us, at least.
My most common trip is 4 - 7 weeks. In that period, there is usually some change in season. Packing now for Chicago. The leaves will turn and fall while I am there and I bet I will see a temp range from 60's to 80's.
Also, I like to have my own stuff and did pack quite quite a bit heavier than I absolutely need to. In for a penny, in for 50 lbs.

For me checking bags is not an option no matter how long the trip or where I am going. The huge amount of lost time and productivity due to checking bags, plus the giant PITA when a bag is lost means I just use the hotel laundry on the road and buy clothes if I need them. When I am going to cold then warm places, I just pack a few older shirts that I don't want anymore, then toss them when I go to the warm place. Or vice versa.
I travel all over the world on business usually going from a few days to a month and I always do it with one shoulder bag and one laptop bag. The expense of hotel laundry and buying a few items is tiny compared to the productivity I gain.
Another big problem with checking bags (if you are a serious business traveler) is when you have to change flights at the last minute for whatever reason. If you bag is in the bottom of the plane you were previously going to take, you are screwed.