packed

refers to a meal prepared at home and carried to be eaten elsewhere, typically at school or work

座无虚席的体育场

describes a sports arena that is completely full of spectators

坐满了人的体育场

describes a group of spectators that completely fills a venue

describes a large group of people gathered closely together

describes a large room for performances that is completely full of people

打包好的行李箱

describes a suitcase that is filled tightly with belongings

为旅行准备好的，物品整齐放入的箱子。

压实的雪

describes snow that has been compressed into a dense, solid layer

形容被压缩成致密、坚实层的雪

describes earth or soil that has been compressed and hardened