Why is there a piece of plastic in the Three Sixty Vodka bottle?

Yesterday, I bought a Three Sixty vodka to decorate with glitter (for a birthday). However, I'm now encountering the problem that the bottle has a piece of plastic (through which the contents flow) in the neck. Unfortunately, I don't know what it is, let alone whether I'm allowed to remove it (it could be the…

I received a present from my aunt today. It was in a gift bag covered in glitter and is coming off.

Now I have glitter on my black jacket, pants and sweater 🤦‍♂️ Now I can't get it out anymore. I've rinsed it, vacuumed it. But somewhere it's still glittering, and I can't get it out. Do you have an idea? By the way, the bag is from Tedi and the glitter is very, very small.