||Flexible/bendable electronics, such as roll-up displays, wearable devices, and wireless sensors have attracted much attention through fast development in recent electronic industry. In particular, all‐in‐one flexible electronic devices need flexible components containing electrode, and rechargeable power sources with high electrochemical performance. Graphene as representative carbon nanomaterials is a potential candidate for electrode materials, with distinctive characteristics such as flexibility and high electrical conductivity as well as facile processability for freestanding films without binders. In this study, graphene stacks as anodes of Na-ion storage for flexible devices were prepared by facile vacuum filtration using reduced graphene oxide, followed by heating at a temperature of 800˚C. The prepared FGSs not only exhibited excellent electrical and mechanical properties, but also exceptional sodium‐ion storage capability due to utilizing a co‐intercalated charge carrier.