What paper sizes does the HP LaserJet Pro MFP M128 support?

The M128 supports a wide range of paper sizes including Letter, Legal, A4, A5, A6, B5 (JIS), Executive, Postcard (JIS), Double Postcard (JIS), various 16K sizes, 8.5 x 13, multiple envelope sizes, and custom sizes ranging from 76 x 127 mm to 216 x 356 mm. The input tray has a 150-sheet capacity, and for paper shorter than 185 mm (7.3 in), you can use the short-paper extender tool to adjust the tray.