Overpack means an enclosure that is used by a single consignor to provide refrigeration, protection or convenience in the handling of a single fully compliant package or to consolidate two or more fully compliant packages. FEATURES:Use with two STP-310, STP-320 or STP-320R Systems for " Dual Shipper" - two temperature requirements in one shipmentSystem Components:Outer Box OD 28 x 16 x 13.25", pre-printed with Overpack MarkingSTP-802 Class 6 Infectious Substance Label (1 ea.)STP-803 Class 9 Hazard Label (1 ea.)STP-804 UN 1845 " Dry ice Quantity" Marking Label (1 ea.)STP-809 UN 2814 Infectious Substance Affecting Humans, Category A Label (1 ea.)STP-816 UN 2900 Infectious Substance Affecting Animals, Category A Label (1 ea.)STP-818 UN 3373 Marking Label (1 ea.)STP-819 Exempt Human/Animal Specimen Label (1 ea.)STP-820 Biological Substance, Category B Marking (1 ea.)