Ingredient cartridges and associated fluid mixture dispensing devices are disclosed herein. An ingredient cartridge can include a recyclable fluid storage portion, a recyclable shell at least partially surrounding the recyclable fluid storage portion, and a sturdy portion attached to the recyclable shell and having a device mating interface for a cartridge mating interface on the fluid mixture dispensing device. The cartridge mating interface can be a sliding cartridge mating interface meant to interface with a cartridge that slides into the device. The sliding cartridge mating interface can include a first anchor for receiving a mating interface of a cartridge, a second anchor for receiving a mating interface of the cartridge, and a rail surface. The first anchor and the second anchor can extend from the rail surface. The first anchor and the second anchor can be the tallest protrusions on the rail surface.