Is a backpack considered a carry on?

Related questions

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3. How common is lost luggage?
4. Will I get my lost luggage back?
5. What weight luggage can I take on a plane?
6. How much luggage is allowed on a plane?
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Tags

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6. #jackets
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11. #purses
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13. #umbrellas
14. #diaper
15. #bring
16. #carry
17. #things
18. #usually
19. #people