I have a Kleen Kanteeen and a Fifty/Fifty insulated growlers. They are both vacuum insulated, not foam or anything like that. Both keep beer cold for at least 12-16 hours, and cool enough to still enjoy at 24+
One is flip top and the other is screw top. I think I prefer the flip top for ease of opening, but the size of the opening is larger on the screw top.