Welcome to Stratum 0 in Braunschweig, Germany! We had a bit of trouble finding this place — it’s around the side of a fairly large building that was once a piano factory. The main door was ...

The Stratum XLT measures 22 x 14 x 9 inches (56 x 35.5 x 23 cm) , meaning it’s within the common airline carry-on restrictions. Though, it’s advertised as a 21-inch carry-on ( ...