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 ※We will fold and ship them wrapped in a宅配ビニール袋 (delivery vinyl bag). ※Please note that we will fold the shorter side in the opposite direction. ※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 nature of paper products.