Metal-organic frameworks (MOFs) are promising adsorbents for hydrogen storage, as they feature adaptable porosities, high surface areas and the potential to be functionalized to suit specific applications. Incorporating carbon materials into the MOF matrix has already proved to be a successful strategy for enhancing the specific surface area of the resulting composite material compared with the original MOF. This, in turn, improves its adsorption capacity. This study focuses on the impact of mixing a commercial, high-surface area activated carbon (AC, MSC 30 from Kansai Coke and Chemicals Co., Ltd.) with a well-known MOF, HKUST-1, on the properties of the composite, including hydrogen storage capacity. Resonant Acoustic Mixing (RAM) was used because it provides exceptional powder mixing.