Correct

封套

/ fēngtào / 
Strokes

Definition

envelope/wrapper/(book) jacket/(record) sleeve

Example

As a Noun

big envelope (for holding documents, books)

1
Shū
书
de
的
fēngtào
封套

slipcase

2
Chàngpiàn
唱片
fēngtào
封套

record jacket