Shipping Box, Wall Type Single Wall, Inside Length 18 in, Inside Width 12 in, Inside Height 4 in, 18x12x4 in Inside LxWxH, 32 ECT, RSC, Outside Length 18 3/8 in, Outside Width 12 3/8 in, Outside Height 4 5/8 in, 18 3/8×12 3/8×4 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 17 in to 19 in Length Shipping Boxes