This is the 28L version with an expandable feature that turns it into a 38L backpack. I have had the 28L for over a year and I really like it (I bought it through Bagsmart). It looks nice, it has lots of pockets that are well placed (including a shoe pocket), a sleeve on the side for a water bottle, a trolley sleeve for attaching to luggage, and a padded laptop compartment that fits up to a 15" device. I like the rectangular shape of it, and when I carry it, it lays securely on my back and doesn’t protrude. The Costco version comes in four colors; black, cream, green and navy, and it weighs 2 lbs (mine weighs a few ounces less, but I don't have the expandable version).
When I first bought it, I was thinking I probably wouldn’t like it and was prepared to return it. But after my first trip, I really fell in love with it and now I can’t think of replacing it with anything else. It’s just such a practical bag and it’s very lightweight as well. And I love the clamshell opening, which makes it easier to organize everything.
The Costco deal also throws in a 4-piece set of compression packing cubes. The online price is $65 for the backpack and the compression cubes, which is less than you would find for the backpack itself on the Bagsmart website and on Amazon. It also says it's sold in warehouses. Not in Duluth, unfortunately, but I'm sure in some of the larger cities have it for a a lower price.