緩衝材

1. Origins, structure, and basic meaning

• Structure: 緩衝材（かんしょうざい） means material placed around an object to cushion it against impacts.
• Basic usage: Use it for wrapping fragile objects or filling empty spaces in a box.

2. Common pitfalls and similar expressions

• Wrapping and cushioning
  • 包装材 broadly means packaging material; 緩衝材 focuses on the role of cushioning against impacts.