Our 13.75" L x 10.5" W x 13.5" H (outer dimensions) reusable Insulated Specimen Box is constructed of 275 lb. test fiberboard with 1.5" thick styrofoam interior. When the box is used in conjunction with refrigerant gel packs or dry ice, specimens will remain refrigerated or frozen for several days. The Specimen Shipping Box is provided with two refrigerant gel pack labels affixed to the outside of the box and two cover-up dry ice labels which are affixed over the gel pack labels when dry ice is used to keep the specimen frozen while in transit to the laboratory. Our boxes comply with overnight carrier regulations for shipping refrigerated or frozen biological specimens.