A delivery system for introducing a cargo molecule into cytosol of a living cell can include: a first membrane binding element linked to an endosomal compartment disrupting element through a first linker having one or more anionic moieties; and a second membrane binding element linked to an exogenous cargo molecule through a second linker having one or more anionic moieties, the second linker having a region that is selectively cleavable, wherein the first and second membrane binding elements both induce endocytosis into an early/recycling endosome and the endosomal compartment disrupting element destabilizes the early/recycling endosome such that the exogenous cargo molecule is released from the second membrane binding element and into the cytosol of the living cell.
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