Costco Kirkland luggage is really durable, comes with extra zipper pulls, and has a warranty that you can't beat that doesn't require you ship it to some repair center.
That much said, at least last year's (may have been redesigned for 2011) Kirkland carryon model is technically an inch or so longer than at least one airline size limit (I think I measured it at 24" with the rubber feet things), so you might have to stuff it in lengthwise occasionally. Alaska Airlines has bigger carryon sizing, so those of us in Seattle rarely encounter this problem. I returned my Kirkland carryon (still have the bigger model) after hitting the size limit one time.
Personally I travel with a Timbuk2 Checkpoint carryon which is well under any of the airline size limits and has a compression board that lets me pack tight without Spacesaver bags, though I miss a suit carrier. Pretty affordable both online or from retail at REI. Their customer service is outstanding too though not as convenient as Costco.
That much said, at least last year's (may have been redesigned for 2011) Kirkland carryon model is technically an inch or so longer than at least one airline size limit (I think I measured it at 24" with the rubber feet things), so you might have to stuff it in lengthwise occasionally. Alaska Airlines has bigger carryon sizing, so those of us in Seattle rarely encounter this problem. I returned my Kirkland carryon (still have the bigger model) after hitting the size limit one time.
Personally I travel with a Timbuk2 Checkpoint carryon which is well under any of the airline size limits and has a compression board that lets me pack tight without Spacesaver bags, though I miss a suit carrier. Pretty affordable both online or from retail at REI. Their customer service is outstanding too though not as convenient as Costco.