You can place you soap on the bamboo grill either while it's either nestled in the soap dish or independently. The dish is easily drainable, easy to keep clean and dishwasher safe on a top rack.
Cornstarch is well known for its use in food, but this evolutionary combo with bamboo fibers makes it a sustainable plastic replacement that's durable and mildew resistant. Unlike plastic, if you bury this thang in dirt, it will naturally degrade, causing no harm and no waste. Why use anything else?