I was surprised when I ordered my red bag and received a significantly smaller size duffel than what I thought I was going to get.  When I first looked at the product details, the default black bag was selected, so it showed dimensions of 36 x 14 x14 inches.  I didn't notice that changing the color of the bag also changed the bag size.  So for everyone shopping for this bag, be sure to check the bag dimensions so that you know exactly what you are buying.

Color: Black
  Product Dimensions: 14 x 36 x 14 inches

Color: Blue
  Product Dimensions: 9 x 22 x 9 inches

Color: Green
  Product Dimensions: 18 x 40 x 18 inches

Color: Navy
  Product Dimensions: 14 x 30 x 14 inches

Color: Red
  Product Dimensions: 24 x 12 x 12 inches

All in all, this is a very strong bag that packs into it's own side pocket for storage.  The material is 900D nylon - which is 2x as strong as 400D nylon (which most inexpensive duffel bags are made of).  The straps wrap around the bag and are stitched the full length of the sides.  This is a much more durable design and less likely to suffer broken straps.  Everything on this bag is excellent quality and design.  It's an easy 5 star bag for the price.  The only downside - which is not the manufacturer's fault but Amazon's fault - is the unclear sizing information.