Flasks, thermoses and larger quantities of food will all be banned.
Liquids of more than 100ml, camera tripods, phones, flags of countries not involved in the Games along with umbrellas (no rain predicted then?) are also all banned.
"Security" may well be the fig leaf excuse used by organisers for this ban. However, the real reason lies with the money being generated by sponsors from their marketing campaigns and food/drink etc concessions at the Olympic venues.
The Olympics is not about sport, but about money!
Olympic Medals won during the Beijing 2008 Olympics
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