I love this bag even though I haven't used it yet!  I usually don't like reviews of items when the reviewer hasn't used the product yet, but I wanted to address some of the issues other reviewers raised.  No smell in my bag!  The zippers work very well, and the handle opens and closes smoothly.  I put a standard water bottle in the side holder and it fit snugly...just what you want.  The included back-up bag is just a bonus.  I didn't purchase this for the back-up bag, so I didn't expect much.  It's basic...looks like it came from Target or Walmart.  Good for a "back-up" ;) I recently purchased the Delsey Luggage Helium Fusion 3.0 Trolley Bag, and I returned it.  It was wider than I wanted, and it reminded me of a briefcase.  This Travelon bag has more style, and I want something that will fit under the seat.  I'll add a review once I'm able to use it, but first look is great!

UPDATE - I have used this bag twice since I purchased it.  After the first use, the main zipper separated at the seam.  I contacted Travelon through their website, and I received an immediate response and instructions on how to obtain a new bag.  I received the new bag within 3 weeks.  I just used the bag on an overseas trip, and it is great for the plane.  I did not put it under the seat as I intended because the flight was so long...I wanted room.  It is small and easy to put in the overhead bin.  My iPad is in a case, and it was a VERY tight fit to put in the front zipper compartment.  My new case with keyboard would definitely not work in the front compartment.  An iPad with no case would be an easy fit. I also used to the water bottle pocket, too.  It was very snug and held the standard sized bottle well.  It holds quite a bit, including a change of clothes and the quart size bag of toiletries fit perfectly in the plastic zipper pocket inside. Despite having the return the bag, I still LOVE this bag.  It is the perfect size for me...not too big...but easy to roll around.