Customer provided stainless steel is the ideal, IMO. Glass also, if someone can make a glass container that's not hot to the touch and doesn't shatter on the go

Customer provided stainless steel is the ideal, IMO. Glass also, if someone can make a glass container that's not hot to the touch and doesn't shatter on the go, and that isn't enormous. And as for the increased energy required to create and clean these stainless steel and glass containers, the goal should be that this soon becomes a "who cares" problem as we fully transition to renewable energy and storage. Admittedly, "soon" very much seems to be a material possibility, but a political impossibility. And of course there is always opportunity cost when deciding how to divvy out grid capacity, so I am smoothing over some of the complexities of the issue here, but I don't think unreasonably so.