Midol - been asked 100 times for this threw out the season
a pack of disposable razor & spray deodorant -- dont ask, but it is used almost EVERY tournament
Nail clippers
super glue - good for blisters & that extra grip needed to make the ball spin

(kidding)
saran wrap - cut a normal roll in half &you got a great way to wrap ice bags to a player
that brown stretchy wrap that sticks to its self - not sure what its called but its a great quick cover for minor cuts & scraps..
scissors or small pocket knife
Tums
benidril stick -- good for bee stings & mosquito bites
contact solution / cleaner