What are waterproof backpacks made of?

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Tags

1. #laminated
2. #nylon
3. #shelf
4. #usually
5. #common
6. #modern
7. #coated
8. #material
9. #waterproof
10. #coating
11. #water
12. #although
13. #being
14. #before
15. #plastic
16. #repelling
17. #construct
18. #agents
19. #simply
20. #silicone