Shipping Box Wall Type Single Wall Inside Length 20 in Inside Width 18 in Inside Height 12 in 20x18x12 in Inside LxWxH 32 ECT RSC Outside Length 20 3/8 in Outside Width 18 3/8 in Outside Height 12 5/8 in 20 3/8x18 3/8x12 5/8 in Outside LxWxH Wall Thickness 1/8 in Fluting Profile C Flute Maximum Load Capacity 65 lb Material Corrugate Color Kraft Post-Consumer Recyclability 100 Percent Standards ASTM D5118 Inside Length Range 20 in to 22 in Length Shipping Boxes