We looked for lightweight bags to avoid fees and these are the bags we landed on.  We bought 4 and traveled to Europe from US and man what a pleasure than a suitcase.  You fit more, they are lighter, but you have to be able to carry it because there are no wheels.

Great bag to throw into a suitcase if you need and use as a laundry only since it can be crushed into another bag.

Did not even look to tear, zippers are strong.  I was nervous, but was very happy with the result.