They won't let you. You can carry small clear bag though.
No backpack, however clear see through bag is permitted. Unopened water bottle ok, no other good, and no umbrellas allowed. You can bring a poncho, see through for rain
You can bring a warm bottle of water, and that's about it. Not kidding. Think TSA airport check with a small clear bag.
Not at all. A small clear plastic bag is acceptable
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