I just received the AT splash 21" in Turquoise from Amazon. While I haven't been able to test it out yet, it appears to be a great quality piece of luggage. The interior is roomy and fabric feels durable; zippers are good quality and heavy; canvas feels nice and is a great color. The wheels also feel sturdy and roll really well. I'm a fan. It would have earned 5 stars, except for the measurements.

When measured, I found it to be approximately 21.5" H (if you count the hard plastic 'feet', but  not the carrying handle) x 13.75" W x 11.5" D, which equals 46.75 linear inches. These measurements were taken on an empty bag. Granted, if you squished the outer zippered compartments down, it would easily compress to a smaller depth. However, I'm concerned, because we are about to fly Delta, which limits carry-on luggage to 45 linear inches. Another reviewer mentioned using this piece on a Delta flight, so I hope they won't be too picky. We definitely won't be adding anything to the exterior pockets!