Runners in a half-marathon in London on March 1 might be a little confused at the water stations, where instead of getting water in a plastic cup or bottle, they’ll be handed an edible water-filled pod. The package, which is also compostable, is made from seaweed and plant extracts. You simply bite the corner off and drink.

“What we want to do is have a bulletproof solution—regardless of where it ends up, our packaging will not create negative consequences,” says Pierre-Yves Paslier, cofounder of Notpla, the startup that makes the packaging. “If nature can deal with it if it ends up in the wrong place, that’s the ultimate kind of protection.”

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