Improving volumetric uptakes often comes at the expense of gravimetric uptakes, as seen in many strategies. For example, COFs with smaller pores, such as MSUCOF-3, tend to be denser than those with larger pores, such as MSUCOF-1 and MSUCOF-2. Although the MSUCOF-3 family exhibits the most impressive volumetric uptakes among these three, it also has the lowest gravimetric uptake of up to 6.7 wt % (Figure ). In contrast, the MSUCOF-2