你包装的是什么东西?
What are you packing?
或
What kind of stuff are you packing?
你们用的包装材料是什么?(你们用的包装物料是...)
What kind of packing material do you use?
你包装的是什么东西?
What are you packing?
或
What kind of stuff are you packing?
你们用的包装材料是什么?(你们用的包装物料是...)
What kind of packing material do you use?