I just bought the Eagle Creek Tarmac 22, and ordered this duffel to go with it.  I have now taken both on their first trip, and am very pleased with both.  The duffel folds flat, so is great to stow on the bottom of your suitcase to carry extra purchases made while on vacation.  It is soft and spacious, and I was amazed at how much stuff I fit into it.  The small size is just right for me as a carry-on for makeup, medications or anything else I don't want to check.  It's also big enough that I could use it for an overnight trip.  If you are buying the suitcase, I strongly suggest you think about getting this one too.