The estimated surface coverage for the Cu I sites at 5 bar and 298 K is 85%, 36%, and 19% for Cu I Zn-MFU-4l, Cu I Mn-MFU-4l, and Cu I Cd-MFU-4l, respectively, while at 100 bar it is 99%, 92%, and 83%, respectively. Thus, the fraction of the usable Cu I sites for a 5-100 bar pressure swing is estimated to be 14%, 56%, and 63% for Cu I Zn-MFU-4l, Cu I Mn-MFU-4l, and Cu I Cd-MFU-4l, respectively. A similar calculation for a 5-170 bar swing at 298 K yields 14%, 59%, and 70%, respectively. Note that the usable fraction of the Cu I sites in Cu I Cd-MFU-4l matches the theoretical maximum value for the usable fraction for the condition of interest (63% and 70% for 5-100 and 5-170 bar swings, respectively). These analyses suggest that the H2 binding strength at Cu I sites in Cu I Cd-MFU-4l is indeed optimal for maximizing the usable fraction of the adsorption sites for ambient-temperature storage.