Yes, you can.
Yes, you can take a backpack on a plane as carry-on luggage as long as it still fits the size and weight restrictions for carry-on baggage.
When you get to the right rank, you get the backpack as a reward. The backpack is permanent (and free).
It depends a bit on your personal preference. I prefer a backpack so my hands are free. If you are concerned about the weight I would choose a rolling case.
you bring paper and pencil and a backpack
Yes, it is generally recommended to bring a professional-looking briefcase or portfolio to an interview instead of a backpack. This will give a more polished and organized impression to the interviewer.
If you can bring a military tactical 30L backpack to school will depend upon the school you are going to. Many schools are now requiring students to wear only clear backpacks, so this backpack would not be allowed.
You can bring a backpack on a plane as a personal item. Most airlines will allow you to carry on the backpack rather then check it in.
No, you cannot bring a razor through airport security.
a backpack
you put it in your locker or just dont bring one
you put it in your locker or just dont bring one
You would have to get a player to give one to you. Otherwise you would have to buy the TCG cards, over an over. The Chatty backpack is a rare reward.