Chests contain extra-thick foam plastic insulation core. It takes 6 days for 90 lb of dry ice to sublimate to 5 lb in 0372102 03721-02; 10 days for 155 lb in 0372102 03721-00; and 15 days for 215 lb in 0372102 03720-00. Models 03721-00 and 03721-02 have handles for easy carrying. Nsf certified. Order dollies separately for improved mobility. Interior dimensions: 13-1/3"L x 13-1/4"W x 12-5/8"H.