I used to have a coughlans 4-1 function whistle, it almost fell apart, after some use and the compass got stuck. Not recommended.

i would add some lighting things: like flashlight or headlight. The light sticks usually aren't very reliable. *edit* i see you got 2 LED lights, missed it the first time. Mine experians with multi LED lights with more than 3 or 4 LEDs are in general bad. Most of them are not very reliable and made very cheaply.

might post more later, have to go to class first.