I use this bag both with and without the packing cubes inside, and I love it! One cube hold my bike helmet, shoes and camelback, and so I always have my bike stuff ready to go. The Mud box is handy for wet and dirty stuff. I can organize my paddle gear in the big duffel which is bombproof and easy to pack. Good stuff.

i got one of these bags over a year ago for my wife. she has a little trouble staying organized. these compartments make it very easy. so now i'm on the road for a few weeks and it was the obvious choice for me. it makes a great collapsable footlocker once you get where you are going. i've even purchased a couple of extra mud boxes to throw extra stuff into. so far, it's a great bag.
Pros - good size and dimensions, removable compartments, easy access zipper openings, functional handles
Cons - fully loaded this easily exceeds the airline 50 lb weight limit, i know, no where does it say it say intended to be airline luggage and here's why. the same material that makes it light and collapsable makes it lousy for dragging or tumbling around on a conveyor belt. the only other thing that i don't care for is the lack of a shoulder strap. they give you D-rings to attach one to but you have to go get your own, what a slap in the face. so, use it in your car for anything from clothes to climbing gear. it's durable but it can be punctured.