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First, non-sorted, pinned material is stored in various small plastic household boxes like this smiley one. The background is cut for a cheap, used camping mattress :). The background is glued to the box with any glue at hand that is not water-based (I've used rubber cement and silicone). They are rather small, typically 15x15 cm. Cost per box: 2-3?.

A few times a year, I empty all these small boxes and sort the flies to family level for further identification. At this time they are moved to the 'collection proper'