I've had a variaton of this bag for over 20 years.  It's lightweight, expandable and just the right size for both commuting to work and any kind of travel.  The zippered pockets and top that can either pop up if you have lots of items to put in it or push down if you don't need the extra storage make it a perfect carry-on for air travel.  I'm a huge fan of this particular bag and plan to keep replacing them as they finally wear out after years of use. It is a bit pricey but I searched and found that some patterns were more affordable than others.  I don't know why there's such a price variation as it's virtually the same tote bag but I did get a fair price for the one I purchased.