"I bought this bag as a b-day gift for my daughter, mostly so she would return MY bag. I use this bag for both business and personal use. My laptop, purse, change of clothes and toiletries fit in the bag for a quick business trip. I fold it flat and bring in my carry-on bag for longer vacations. I used it for grocery shopping in Prague, holding lunch and activities for the train trip from Budapest to Vienna. In general, a great extra bag.
My daughter borrowed it when traveling with her toddler. She could keep her purse, condensed diaper bag, toys and other items for the long plane trip. The expansion helped keep her within the maximum carry-on items. The zipper keeps everything in the bag. All fits under the seat. My daughter wanted the polka dot print as it would be more distinct and less likely to be mistaken.
Durability is good. Mine has been filled to the brim, especially when stores charge for bag. So far no tears or rips."
"I got this to take to Europe as my carry on and about town bag. The size is good for that. Not sure what the "expandable" part is- it is one size, but you could conceivably fold the top down inside itself to make it smaller if you don't need so much room. It is lightweight and lots of pockets. Just wish there was one a tad bigger on the outside for a water bottle."