What bag should I get for Secondary school?

I started secondary last year and I have found that I've changed my bag like 7 times. If I were you I would get a cheap bag from primark to start because as you get in to the school year people start to follow a 'bag fashion' where one type of bag is really popular. There isn't much point on getting a really expensive one to start with as it will just get ruined, just try to get something comfortable for carrying books in :)