At the place I go, they make everything in a metal container and then pour it into my thermos on the counter. It's up to me to handle the lid.
Also not to get too deep into the weeds on environmentalism but you all know the line reduce/reuse/recycle? the two first Rs it seems like we as a society have decided to just overlook. I've been using the same thermos for 10 years and I guarantee that in terms of footprint my thermos is doing better than literally any disposable solution you can come up with. People are wasting SO MUCH material, time, and money trying to sustain disposability when a real solution is on the shelf at every retailer right now ready to go.