This is for city folk. We have a need in the city for a good 'life in a bag'. Not necessarily a kids 'backpack'. But a good everyday bag that holds a lunch in a foil pack, and random shopping. And everything needed for the day, every day...computer, tablet, etc. Big enough but not too bulky. My Brooklyn Industries messenger bag has been a big love for 5-6 years. Two zippers broken and looks a bit rough. They don't make that model now.
Randomly checked ManhattanPortage. (I have a small bag from the SoHo store.)
Food related since I take it to markets. Killer price for the quality. For travel it opens flat going through security. A back sleeve fits over our carry-on. (my loved one I have been using flops all over my wheeled carry-on).