Is a backpack considered a personal item or carry on?

Related questions

1. Can you pay for extra baggage at the airport?
2. How heavy can a carry on bag be?
3. Can I buy an open plane ticket?
4. Does a backpack count as a carry on?
5. Do Aegean miles expire?
6. Can baggage allowance be shared?
7. Is Olympic air safe?
8. Is Aegean air safe?
9. What does 2pc mean for baggage allowance?
10. How much do you pay for luggage?

Tags

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2. #along
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5. #allowed
6. #items
7. #bring
8. #airlines
9. #allow
10. #backpacks
11. #carry
12. #jackets
13. #people
14. #considered
15. #laptop
16. #diaper
17. #things
18. #usually
19. #majority