BEST FOR: Slipping through airports discreetly.
THE TEST: The Covert ICO is padded on all sides with dense EVA foam, and there’s enough structure to protect your gear from bumps and give the bag a solid rectangular shape. Unlike ordinary duffels, it stands up on either end without tipping over. At two and a half pounds, it was the lightest carry-on in our test. Even more impressive: you can wear it as a shoulder bag or backpack (the straps tuck away), and there are two pockets inside and a padded laptop sleeve.
THE VERDICT: Sleek and lightweight, just don’t overdo it—it doesn’t carry well when overstuffed. 2.5 lbs.