100% virgin paper components used throughout the Doublewall construction to provide superior performance for long one-way shipmentsWax impregnated components for resistance to failures in adverse conditions.Sesame tape construction to prevent and control scoreline tearingPatented lock-bottom flap for fast, easy setup by one personAvailable in ClassicPak for low product density applications, Classicpak plus for medium density applications and ClassicPak premium for high density applicationsClassicPak and ClassicPak plus available in 40 and 50 inch depths. Premium available in only 40 inch depth