Is a backpack considered a personal item on a plane?

Related questions

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2. What is hand baggage only fare in SpiceJet?
3. Do you pay for baggage on Air Canada?
4. Does laptop weight count as carry on baggage?
5. Can you take two bags as hand luggage?
6. Is laptop bag considered as hand baggage in SpiceJet?
7. What does baggage 2pc mean?
8. Can I bring a backpack and a carry on Air Canada?
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Tags

1. #briefcase
2. #backpack
3. #inches
4. #purse
5. #check
6. #bring
7. #carry
8. #airlines
9. #allow
10. #filled
11. #larger
12. #maximum
13. #personal