Get the Popular Science daily newsletter💡 Breakthroughs, discoveries, and DIY tips sent every weekday. Chances are sushi aficionados have left a restaurant take-out in tow and with a handful of adorable, but environmentally problematic, fish-shaped soy sauce packets. These single-use plastic “shoyu-tai” drip bottles are as iconic as they are convenient, but their small size and disposability mean they often end up sliding down sinks and into drains. Eventually, these plastic faux fish make their way to landfills or, worse, the ocean. Once in the big blue, they slowly break down into microplastics that are then eaten by real fish. Ironically, those microplastic-filled fish may one day end up nestled between rice at a sushi bar. One Australian state has already passed legislation banning the plastic fish-shaped soy sauce packets, and others are reportedly considering following suit. But designers at Heliograf and Australian design studio Vert Design may have found a way to keep the fish packet alive—albeit in a more sustainable form. Their newly designed fish is called Holy Carp! and is made entirely …