Compared to fixed-end type, collapsible flatracks have end walls that fold. The flushfolding collapsible flatrack, the most sophisticated of its types has end walls which fold flush with the base.
Flatracks are dedicated for the carriage of heavy, bulky as well as over height and/ or over width items.
They also permit the stacking of several empty containers into one 'bundle' for empty repositionning. Their base is often designed to transport heavy material. Some flats are 45T tested. The flatracks with collapsible ends also permit the transportation of over length cargo.