"I have a package" 可以说成 "I have a parcel" 或 "I have a package"。
"Parcel" 来源于法语 "parcelle"，意思是分割的小块土地，后来用来形容小包裹或包裹。
例句：
I have a parcel to send to my friend.
I have a package that I need to pick up from the post office.
翻译：
我有一个要给我朋友寄的包裹。
我有一个需要从邮局取走的包裹。