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but then why hide it under the bottle?

It’s just strategy.

If I have a penalty kick and you’re the keeper, I want to know if you know where I kick the ball most often. If I know that you know, I will kick somewhere else.

So if you’re the keeper and you know my habits, you have a slight advantage if I don’t know that you know. So you would hide the list.

Easy hey?

It’s not hidden. It’s just on the bottle because it’s convenient for a keeper to reference.

The bottle was wrapped in a towel.

I have no idea what the Euros rules are, but this could have been him wanting to keep all his stuff together without the paper blowing away.

I can't say for them, but towel is good heat insulator and can keep bottle content cold. I use it often for that reason (either towel or other clothes that's already in backpack).

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