I would add some twine or thin rope. It weighs nothing and is really helpful when you need to fix things or improvise a shelter. Maybe a small compass, a miniature fishing % sewing kit plus a firestarter tool (just in case the lighter fails) and you're good to go.

Basically I'm a big fan of the SAS-style tobacco can survival kit. It fits nicely in a cargo pocket on my BDU's. The tin cover also doubles as a signal mirror.