The Thule Aion Travel Backpack 40L is built to hit the sweet spot for air travel — the maximum capacity that's still classified as carry-on compliant, so you can pack more without risking it being pulled aside at the gate.
A removable rolltop bag gives you extra flexibility: keep it attached for additional capacity on the way out, then pack it away once you've made room by using up supplies or shopping along the way. It's built for travellers who want one bag that does it all, from the flight over to exploring once you've landed.
