袋

1. Origins, structure, and basic meaning

• Structure: 袋 (ふくろ) is a bag or sack used to contain items. Both examples use container marker に, with different material and scale.
• Basic usage: Bought fruit goes into a paper bag; winter clothes are packed together in a large sack.

2. Common pitfalls and similar expressions

• Paper bag for fruit and large sack for clothing
  • 紙の袋 specifies material; 大きな袋 specifies size. に入れる and に詰める distinguish ordinary placement from packing.