"The security company also dictates the quantity of items allowed:
one container of hummus and canned tuna,
one small bottle or can of beverage,
one or two slices of cheese,
a few spoonfuls of sugar,
and 5 to 10 olives. The exact amount depends on the mood of the Israeli guard, but its important that the Palestinian not try to cross with less than 5 olives.
Workers are also not allowed to carry cooking utensils and work tools.This is just cultural sensitivity, because Arabs like to eat with their hands. "
From the indispensable Kabobfest (Thanks Marcy)