Messenger Sling

Messenger Sling
Backpacks or messenger bags?

I need to get a backpack, I have to take about 10-20 pounds. of things from school every day because I can not leave my local [ranging from the end of the school to the other all classes and only have 5 minutes to get through the traffic really is] hard to what is a good backpack or Messenger Bag that is strong and cheap? I just want something normal, probably black. "These bags take a long deep? I like the ones better.

Messenger bags. Try to find a Dickies one, I've had mine forever. They are about $ 40.