The smallest size (standard minimum size) for Yu-Packet and click posts (depending on thickness) and non-standard mail. (Both shipping services are the smallest size of 5.5 inches (14 cm) long and 3.5 inches (9 cm)). *Nekoposu. Please check with each shipping carrier. Please be aware of the thickness of the contents. These are small envelopes but are padded with a foam inside. Unlike ordinary envelopes, the foam on the inside protects your items and other items from impacts. The seal comes with double-sided tape, so there is no need to use separate tape. It has a tape opening process, so it can be opened smoothly when you receive it. By thinner (small) the thickness of the cushioning material, it is not only space-saving, but also limited to thickness (height) and is imported, some specifications may vary depending on the production date and Lot. There may be an inevitable error of ± 0.2 inches (5 mm) during the manufacturing process. The listed values may differ depending on the storage method, elapsed time, and environment of measuring equipment. Please acknowledge If the contents are in a large size, we recommend ordering a larger size.