A parcel sent by post; a package dispatched through postal services, often trackable and sometimes insured.
彼女は友人に郵便小包で誕生日プレゼントを送った。
She sent a birthday present to her friend by parcel post.
郵便小包は追跡番号で配送状況を確認できる。
You can check the delivery status of a parcel with its tracking number.
国際郵便小包は関税がかかる場合があるので注意が必要だ。
International postal parcels may be subject to customs duties, so be careful.