--- description: Find out why Sway TPSea Flex is on TIME's list of 2025's best inventions. title: Sway TPSea Flex: The Best Inventions of 2025 image: https://static.time.com/v3/assets/bltea6093859af6183b/blt77d351f4620005d5/6998ca50c8dcb482efb50866/sway-time-best-inventions-2025-24.jpg?branch=production&width=3840&quality=75&auto=webp&crop=16:9 --- Oct 09, 2025 # Sway TPSea Flex Compostable retail bags by [Chris Stokel-Walker](/author/chris-stokel-walker/) ## Chris Stokel-Walker Update your preferences in [Account Settings](/account/preferences/) Close  Peter Garritano for TIME Plastic bags are one of retail’s biggest eco-bugbears. But Julia Marsh, CEO and co-founder of Sway, created an environmentally-friendly alternative with [TPSea Flex](https://swaythefuture.com/tpsea-flex "undefined"): a glossy, translucent film spun from farmed seaweed that can be fed through legacy plastic-bag lines and matches polyethylene’s toughness, but is fully compostable. Marsh launched TPSea Flex in 2024 after testing 400 different formulations, and has attained $8.5 million in funding to date—plus a client list including J.Crew and Prana. “We will be tripling volumes every year, and we have functionally no limit on capacity,” Marsh says. About 100,000 pounds of TPSea Flex will end up in millions of shopping bags this year. These are independent reviews of the products mentioned, but TIME receives a commission when purchases are made through affiliate links at no additional cost to the purchaser. Sway TPSea Flex: The Best Inventions of 2025 ```json [{"@context":"https://schema.org","@type":"Article","@id":"https://time.com/collections/best-inventions-2025/7318428/sway-tpsea-flex/","mainEntityOfPage":{"@type":"WebPage","@id":"https://time.com/collections/best-inventions-2025/7318428/sway-tpsea-flex/"},"headline":"Sway TPSea Flex","datePublished":"2025-10-09T11:00:17.000Z","dateModified":"2026-04-13T11:54:53.970Z","description":"","url":"https://time.com/collections/best-inventions-2025/7318428/sway-tpsea-flex/","keywords":["Tech","E-Commerce","list","franchise","Magazine","best inventions","Special Project","sponsorshipblock","Accolades","Best Inventions 2025"],"thumbnailUrl":"https://static.time.com/v3/assets/bltea6093859af6183b/blt77d351f4620005d5/6998ca50c8dcb482efb50866/sway-time-best-inventions-2025-24.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","author":[{"@type":"Person","name":"Chris Stokel-Walker","jobTitle":null,"url":"https://time.com/author/chris-stokel-walker/"}],"creator":"Chris Stokel-Walker","articleSection":"Business","image":[{"@type":"ImageObject","url":"https://static.time.com/v3/assets/bltea6093859af6183b/blt77d351f4620005d5/6998ca50c8dcb482efb50866/sway-time-best-inventions-2025-24.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","width":1200,"height":675}],"publisher":{"@type":"Organization","name":"Time","url":"https://time.com/","logo":{"@type":"ImageObject","url":"https://time.com/images/logo.png","width":528,"height":156},"foundingDate":"March 3, 1923","sameAs":["https://www.facebook.com/time","https://www.instagram.com/time/?hl=en","https://twitter.com/time","https://www.pinterest.com/timemagazine"]}},{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"/section/business/","name":"Business"}},{"@type":"ListItem","position":2,"item":{"@id":"/tag/time-section-tech/","name":"Tech"}},{"@type":"ListItem","position":3,"item":{"@id":"https://time.com/collections/best-inventions-2025/7318428/sway-tpsea-flex/","name":"Sway TPSea Flex"}}]}] ```