A tough back pack.

[kenwshmt2]

http://www.citynews.ca/news/news_13653.aspx

The brainchild of this one-of-a-kind book-bag (that looks just like a regular backpack like the ones pictured) came about after the shooting rampage at Colorado's Columbine High School prompted a couple of Boston-area fathers to come up with a way to protect their kids if a gunman ever attacked their school. The result was a $175 (US) schoolbag with a bulletproof lining.

If you bike in some neighborhoods you shouldn't be.
Yes I know you guys are supposed to be gun less, but its the bad guys with the guns anyways, right?