Nanoparticles are provided comprising an inner core comprising a non-cellular material, and an outer surface comprising a bacterial membrane, e.g., a bacterial membrane derived from a bacteria outer membrane vesicle. Also provided are compositions, e.g., medicament delivery systems and pharmaceutical compositions, comprising the present nanoparticles. Also provided are uses of the present nanoparticles, pharmaceutical compositions and medicament delivery systems for treating and/or preventing a disease or condition, e.g., bacterial infection, in a subject.