ZX Bigger Carry-on 21'' | Zipperless Aluminum Frame, TSA LockThe Aluminum Carry On Built for People Who Refuse to Check a Bag. 21 inches. ~41L. Still fits overhead. More room. Same aluminum frame. No checked baggage fees. What Makes It Different 15% Bigger. Still Carry On. At 21", you get ~41L roughly one extra outfit, a pair of shoes, or the toiletry bag you'd otherwise Tetris into the sides. Compliant with most major US airline overhead bins. Note: Always verify your carrier's current size policy before