Plastic freezer boxes include both polypropylene, and the more durable polycarbonate boxes.
Polypropylene is the recommended choice for typical freezing activities that are no lower than -86C.
For LN2 cryostorage choose a Stellar Scientific polycarbonate freezer box.
Sold in multi-packs, usually of four or five boxes each, and available in a variety of colors to help identify samples.