I’ve made a Gridfinity SD and USB holder with extra space: a compact organizer for SD cards and USB drives that keeps all my accessories in one place. I customized it from an existing Gridfinity card holder (https://makerworld.com/it/models/521388-sd-and-microsd-card-holder-gridfinity?from=search#profileId-441235) because I couldn’t find a version with enough room for both cards and small tools.