What’s the lightest 1 liter vacuum bottle

Probably the now-discontinued Nissan titanium one. The stainless ones seem similar in weight, although certainly not identical.

I suppose the Ti ones might pop up on ebay, as the MSR fuel bottles do from time to time.

Does it have to be a vacuum bottle? Any bottle that can withstand heat which is well wrapped it clothing or whatever for insulation will serve. Mary

let me clarify.
i'm looking for a steel/titanium thermos that would take some abuse without braking. still the lighter the better. purpose: high altitude expedition.
thanks for any details