The K19 is a ONE-SIZE-FITS-ALL plate carrier that will fit all body types, shapes and sizes.
See how the plate carrier adjustments work here:
What About Plate Size?
Good News-the K19 has “one-size-fits-most” plate bags. They will fit any ballistic plates that are sizes S, M or L. To Check if your plates are too big for the K19 see maximum size here: