Some of the documents required to be submitted at the customs office include the
pack list, trade document, shipping document, regulation form and sometimes also the
country of origin. Import shipments to Singapore, Malaysia and Thailand are typically
divided into four categories, namely, documents (no value), low value-shipments,
non-dutiable shipments above a certain country-specific value, and dutiable shipments.
For the last two categories, customs usually require more information. For instance,
in Singapore, documents (such as mail) can be processed quickly, but dutiable
cigarettes are checked very carefully.