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.
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.