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Thermos Flask
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Franco Darioli
(Franco) - M

Locale: @Tarptent
Thermos Flask on 12/21/2012 02:50:08 MST Print View

Yes , inside the pack. But I suspect that inside the freezer the contact against either the grate or other frozen stuff will rob the flask of heat faster than air (or inside a pack) , but my main point was that those insulated containers (non vacuum) are a lot less effective.
BTW, 1 L will of course remain hotter than 750 and 500ml and even more so as you open the flask to drink from it every half an hour or so.