満杯

1. Origins, structure, and basic meaning

• Structure: 満杯 is read as まんぱい and is a noun and na-adjectival expression for a container or place that is completely full or at capacity.
• Basic usage: A full trash can appears in ごみ箱が満杯だ, while a venue filling with spectators appears in 会場が観客で満杯になる.

2. Common pitfalls and similar expressions

• No capacity remaining
  • It is not limited to cups and can broadly describe a bin, venue, or other space filled with things or people.
• Difference from 満員
  • Compared with the term mainly used when all places are occupied by people, this word also applies broadly to containers and objects.