i always have: 2-4 racquets
tennis shoes
flip flops( for before or after game or practice)
extra socks
hair clips or headbands( to keep my hair out of the way)
i pod
wristbands
visor
change of clothes( when i have to)
3 bottles of water
1 bottle of gatorade( or some sort of sports drink)
ACE bandages or tape( when i have sore muscle)
towel
sunblock
jacket

thats about it but sometimes i bring more or less things

what about you??