The bore is medium sized so a lot of different tips will fit with little fuss. However, the triple flanges that I like use with some other IEMs definitely will not fit inside the case. These kind of tips will need to be removed from the IEMs before the IEMs can fit into the case. The sound is also bassier and muddier with triple flanges.
I live under a rock and still listen to things that spin, so things like Instagram, video meetings, and charging cases for wireless IEMs that don't sound like ass are relatively new things to me.