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.
a backpack
you put it in your locker or just dont bring one
you put it in your locker or just dont bring one
no there just in the mattress
Yes, you can.
you bring paper and pencil and a backpack
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.
If your school doesn't allow you to have phones on you, you shouldn't try to hide it. That would only create more problems. But you need to bring it.
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.
Depends on the school and teachers. Just take what you can in a backpack and ask if you can use it. Usually a calculator, pen, eraser, pencil, lead pencil, etc. Sometimes note cards, if the teacher is nice.
i have a bag inside my backpack with my : make up perfume deoderant hair brush hair ties bobby pins mirror gum tampons and lotion
roller backpacks because you have a lot of books