Can a backpack be a carry on?

Related questions

1. What is allowed in carry on bag?
2. What makes a good skateboard?
3. Can you skateboard on the road?
4. Is skateboarding a crime?
5. Is longboarding easy to learn?
6. Are longboards easier than skateboards?
7. How dangerous is skateboarding?
8. Are skateboards considered a vehicle?
9. Is skateboarding safe?
10. How much are electric skateboards?

Tags

1. #typically
2. #means
3. #carry
4. #sized
5. #maximum
6. #light
7. #smaller
8. #dimensions
9. #larger
10. #things
11. #personal
12. #backpack