Only A4 size apparently,
BAG POLICY
To make Wembley safe for everyone, there are restrictions on what you can bring in a bag into the stadium. Here’s everything you need to know.
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What’s allowed?
Each person can only bring one small bag, and it must not be bigger than A4 size:
Height 297mm (11.7 inches)
Width 210mm (8.27 inches)
Depth 210mm (8.27 inches)