Shipping Box, Box Style Heavy Duty, Wall Type Double Wall, Inside Length 18 in, Inside Width 18 in, Inside Height 16 in, 18x18x16 in Inside LxWxH, 48 ECT, RSC, Outside Length 18 3/4 in, Outside Width 18 3/4 in, Outside Height 17 in, 18 3/4x18 3/4x17 in Outside LxWxH, Wall Thickness 1/4 in, Fluting Profile C Flute, Maximum Load Capacity 100 lb, Material Corrugate, Color Kraft, Post-Consumer Recyclability 100 Percent, Standards ASTM D5118, Inside Length Range 17 in to 19 in Length Shipping Boxes