There will be a metal detector when you get into the venue. The backpack is fine as long as there is no alcohol, weapons, food, drink. Kilos of drugs, or any dead bodies in it. It will be hand searched by the security detail. I brought my bag in this past February, so you should be fine.
Yea, they have security checking bags with a metal detector.
I've had no issues with my small pack before at the venue. You should be fine.
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