A method of delivering a cargo agent into cytosol of a cell can include: providing the delivery system of one of the embodiments described herein having the first and second delivery platforms and administering the delivery system to a cell so as to cause targeting of two features on the cell so as to: cause endocytosis of the first and second delivery platforms of the delivery system into a common endosome, destabilize the endosome of the cell having the delivery system, release the cargo agent from the second linker and release the cargo agent from the destabilized endosome into cytosol of the cell. A method of treating a disease can include: performing the method of method of delivering a cargo agent into cytosol of a cell in a subject having a disease, wherein the cargo agent is a therapeutic agent for the disease.
