1x4 Gridfinity storage bin for a cocktail strainer. The narrow offset version should be right for most julip strainers and the narrow (centerline) one should work for most Hawthorne strainers. Other sizes provided to allow you to pick the one that best suits your needs. Wide (centerline) variant can fit more than one strainer if you want to economize on your grid.

Gridfinity Rebuilt OpenSCAB Github page