Yerba Mate Gourds for drinking 6 cm diameter.
Called Pumpkin Gourds, but not sure what sort of pumpkin would have been like this.
Get some Yerba Mate tea, get a straw, and fill the gourd full of tea. Use tea once and refresh each time.
Get a good quality yerba mate straw bombillo and it won't clog up.
The one we have is looking different from this and is a tiny one.