The grey pair and blue pair are smaller than the bamboo rayon Separatec trunks, and the hole wasn't even in the same place on the two cotton ones. On the grey pair, the hole starts at 4 1/2 inches down from top of waistband, and continues for 1 5/8 inches.  On the blue pair, the hole starts at 4 1/8 inches, and continues for 1 7/8 inches. (By comparison, the bamboo rayon hole is 2 1/4 inches diameter and starts at 4 1/2 inches down from the top.)
Unless you want to feel constricted where it counts, and don't mind wearing trunks at different heights on different days, buy the bamboo rayon or micro modal products instead.  The cotton is also thick and heavily stitched around the hole on the cotton version.