Carboxysomes provide a further level of Organization.

http://en.wikipedia.org/wiki/Bacteria

 Micro-compartments such as carboxysomes provide a further level of organization; they are compartments within bacteria that are surrounded by polyhedral protein shells, rather than by lipid membranes.These "polyhedral organelles" localize and compartmentalize bacterial metabolism, a function performed by the membrane-bound organelles in eukaryotes.