The H 2 uptakes for the new N-triazine-COFs were calculated from 1 to 700 bar at 298 K (Figure ). The un-metalated COFs of this family give total volumetric uptakes of 28 to 33 g L -1 while the metalated cases give uptakes of at least 35 g L -1 at 700 bar. Of the three COF families tested, the MSUCOF-3 family gives the best performance in volumetric units of up to 73 g L , where MSUCOF-3-PtCl 2 obtains approximately triple the uptake of the pristine MSUCOF-3. This is due to the high interaction of the MSUCOF-3 framework with H 2 while also having the smallest P size of 7.7-9.4 Å, which avoids wasting useful space. Congruently, this is close to the postulated range of the ideal P size for H 2 storage of 6 to 12 Å. Thus these new COFs can overcome the 2025 DOE volumetric target of 40 g/L and gravimetric target of 5.5 weight %. The excess gravimetric uptakes of the pure N-triazine-COFs are very similar to other top-performing COFs. The metalated triazine-COFs perform as well as the previously discovered promising COF-301-PdCl 2 with total 60 g L -1 and 4.2 excess wt % uptakes at 100 bar and 298 K. In comparison, MSUCOF-3-PtCl 2 at 100 bar and 298 K achieve a total uptake of 60.4 g L -1 and 4.06 excess wt %. bar, which implies that these highlighted COFs remain exceptional even in applications up to 700 bar.