Abstract: The present disclosure provides a system comprising: a) a modified RNA-binding protein (RBP) comprising: i) an RBP; and ii) one or more endosomolytic peptides (ELPs) covalently linked, directly or via a linker, to the RBP; and b) a modified cargo RNA complexed to the RBP, wherein the modified cargo RNA comprises a cargo RNA modified to include one or more RBP binding sites that are bound by the RBP present in the modified RBP. The present disclosure also provides a method of delivering a cargo RNA to a eukaryotic cell, the method comprising contacting the cell with the system of the present disclosure. The present disclosure provides methods of delivering a cargo RNA to the cytoplasm of a cell. The present disclosure provides methods of delivering a cargo RNA to the cytosol of a cell.