| as for robustness | 2 | purpose |
| with water-repellent impregnation | 2 | other |
| with metal zippers | 2 | other |
| backpack → be made from → polyester | 24 |
| backpack → be made of → polyester | 16 |
| backpack → be made of → durable polyester fabric | 3 |
| backpack → be made of → durable polyester | 3 |
| negative | neutral | positive |
| 0.038 | 0.509 | 0.453 |
| Raw frequency | 46 |
| Normalized frequency | 0.574 |
| Modifier score | 0.914 |
| Perplexity | 39.608 |