Because it isn't cool to carry a purse.
Besides, it makes little sister scream when you take her Hello Kitty bag.
This is not just any ol' knapsack either, this one is tied to a golf club. Just in case, on his adventure, there is time to play the front nine.
The contents of the sack are:
- a toy train - for a quick, magical escape
- green power sticks - in case a boy's energy level runs low (like that would happen)
- and toy gun - to battle big brother who is pretending to be a bad guy
- and a set of keys - in case he comes across a locked door.