7-14g is nothing to worry about.

just wear a collared shirt, brush your hair, and look like the type of person that wouldn't have pot on you. don't speed excessively. give the cops no reason to hassle you.

something you could do: triple ziplock bag it so that no smell will get through (to humans). put this inside of one of those Postal Service cardboard package envelope type things you can buy at the post office. Put postage on it, put an address on it and your address on the return address. Stick that in your backpack with books and school stuff. Someone once told me that cops aren't allowed to open letters, its tampering with federal property or something.

Seriously though, its a quarter/half of nugg. You have nothing to worry about.