From a pile of seaweed to a packet of soy sauce.

The London startup Notpla has created a plastic alternative from seaweed that’s biodegradable — and even edible. And it’s hoping it could put a dent in the 300 million tons of plastic waste humans generate each year.

Notpla’s natural plastic-like casing is biodegradable within four to six weeks, the company says, compared to the several hundred years it takes synthetic plastics to biodegrade.