  We discuss FRW universe with time-dependent EoS dark fluid which leads to
multiple de Sitter space. This model (as well as its scalar-tensor version) may
be considered as some classical analog of cosmological landscape. The universe
expansion history may look as transitions between different deSitter eras what
suggests the interesting solution for cosmological constant problem. For
specific time-dependent EoS dark fluid the possibility of transitions between
universe regions with positive and negative cosmological constant is also
established.
