Maximum size for Yu-Packet! A4 cardboard boxes, perfect for Yu-Packet Post, 10 sheets ★ These cardboard boxes can be used as packing materials for Click Post, Yu-Packet (Post), Yu-Pack, and courier service 60 size. Within the standard size for non-standard mail. Size: Inner dimensions - Length 33.2cm x Width 23cm x Thickness 2.6cm Outer dimensions - Length 33.5cm x Width 23.4cm x Thickness 2.9cm Thickness - 1.1mm Total of the three outer dimensions - 60 cm Color: Brown ※ Will be folded and shipped in a宅配ビニール袋 (delivery vinyl bag). ※ Please note that the shorter side will be folded in the opposite direction from the original. ※ If you assemble it with the front and back reversed, it may exceed the regulations of the mail service you are using. ※ Please understand in advance that there may be corner bends, dents, wrinkles, etc. during delivery due to the paper product.