The present invention relates in general to implantable flexible bone composites, and method for preparing the same. The flexible bone composite i ncludes at least one polymeric layer and at least one calcium-containing layer. The polymeric layer can be a polymeric layer including a synthetic polymer. The calcium-containing layer can include a calcium compound such as β-Ca3(PO 4 )?. The flexible bone composites of the invention are useful as bone void fillers and have improved handling characteristics.