Connect any two regular-mouth Mason jars to create a customizable, stackable container. Compatible with widely available jar sizes including 4oz, 8oz, 12oz, 16oz, and 32oz. Keep foods separated until you are ready to eat.Pro tip: open carefully so you do not unscrew the jar that is upside down. ;) Endless Mix-and-Match Uses Quart of salad with 4oz dressing Quart of water with 4oz mixed nuts Pint jar of yogurt with 4oz or 8oz granola Half-pint of carrot sticks with 4oz ranch or hummus Quart of soup with toppings like croutons, cheese, nuts, scallions, or herbs Half-pint of Goldfish crackers with 4oz raisins Half-pint of crackers with a half-pint of juice Food-Safe Materials: Made from BPA-free polypropylene for safe, everyday food storage.Optional Full Liner Upgrade: Upgrade to LFGB European-grade full liners that completely cover the interior surface so food never touches plastic.Durable Construction: Designed for repeated use with regular-mouth Mason jars and built to handle daily use.Easy to Maintain: Smooth surfaces and removable seals make cleaning simple and convenient.Convenient Meal Prep: Ideal for lunches, snacks, travel, and everyday organization.