These cartons are the industry standard! All cartons are constructed from strong 200#/32 ECT, kraft corrugated (unless otherwise noted). • All cartons ship and store flat to save space. • Order in bundle or bale quantities. • Corrugated cartons are all 100% recyclable. • Master Pack Cartons are specifically designed to hold four 6x6x6's in order to reduce shipping costs. • Master Pack Cartons are specifically designed to hold eight 6x6x6's in order to reduce shipping costs.