Luca Colosimo’s genderless accessories brand 10.03.53 has done it again—this time with the Cubi, a backpack designed for spring’s on-the-go energy. Known for experimenting with unexpected materials like ultra-light reinforced concrete, the brand now turns its attention to practicality with a clever twist.

Made entirely in the Paris region from upcycled leather and developed in partnership with Faire de Lance, the Cubi isn’t just another backpack. Its standout feature? A built-in compartment designed to hold and chill a 5-liter beverage pouch, which can be swapped out when empty. But if you’re not hauling drinks, it easily converts into a sleek everyday bag.

Debuted at the brand’s new Boulevard Beaumarchais showroom last February—where waiters sported it during the opening—the Cubi is now officially part of 10.03.53’s lineup. It’s a smart, sustainable take on utility, proving that functional design doesn’t have to sacrifice style.

Check it out below: