Even the white cup for the inner container is made of very thick paper, about 400G g g.
How to make it? Paper cup machine did it, of course. Anyway, I know that there are about seven manufacturers and suppliers of fragrant milk tea cups in China, and Shanghai Li Pin Industry is just one of them. I have seen their machines, fully automatic, step by step bonding molding. I can't understand the details, because I'm not a mechanical expert.
I estimate that the cost price should be 20 or 30 cents, or you can call their manufacturer to try it, but this kind of milk tea cup should have a minimum order quantity. This is the telephone number of Shanghai Li Pin Industry, 02 1-65220876. You can also find it yourself on Baidu or Google.
Are you satisfied?