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fwiw my sigg hot & cold leaks very easily. i accidentally put my bag in an overhead bin on a train forgetting it was in a side pocket and almost immediately had a hot coffee shower when I sat down.
the sigg keeps drinks piping hot (thermos style) while the frank green is more for carting around a drink you intend to have sooner rather than later but it's much more leak proof.
I'll take that as a recommendation. I am in the market for one of these anyway and was looking at the Frank Green, Kleen Canteen, etc. Merry Christmas to me then!