E E.
Like the light weight & collapsable.Tips over VERY easily. VERY hard to turn from cube to bag.
A BIG issue with the 2 I have, is that they tip over very easily! Wheels are closer to the center to fold up & any packed weight on the outside makes them tip over. If they didn't pack, you could put the wheels closer to the outside so it doesn't tip over. I just bought this for my daughter while she was using mine. When she returned, she complained how she hated that it was always tipping over. With the wheels, you have to pull on the shoulder strap, so it's like walking a dog using a leash. If you make them to NOT PACK, you could add a retractable handle to the side. It is VERY difficult to turn them inside out, I just bought another & am returning. It's so tight it took me 1/2 hr of fighting the whole time to turn it out of the pack. Now, over 15 min putting it back & I was working hard the whole time. I had to push hard to flip the stiff center. Sides are so tight I couldn't get the zipper around to flip it. Folding it back, I had to leverage each corner against a hard counter & push really hard.