Experienced referees seem to have everything they could possible need at a match. Here is a list of suggested items a referee should bring.
Uniform Items
Shorts
Shirt
Socks
Black Shoes
Badge of the current year
Game Items
Digital watch, backup watch
Two whistles, varying tones
A set of flags
Coin
Data Wallet, including red and yellow card and scoresheet
Two pens/pencils
Comfort Items
Water
Energy Bar, Banana, Granola Bar
Sunscreen
Water
Folding Chair
Sports drink
Cell phone (do not wear while on field)
List of contact phone numbers
Hand Towel
Garbage Bag (for protecting your equipment in the rain)
Local Rules / Modifications
Shoe brush/polish
LOTG (If you take LOTG with you, do not let others see you reading them)
Extra Water
