VACUUM AND PRESERVE MODE: Turn the top valve on these FoodSaver containers to "Vacuum" and connect your handheld sealer (sold separately) for an airtight seal that locks in freshness to keep foods fresh longer in the fridge, freezer, or pantry MARINATE MODE: Turn valve to "Marinate" to save time in the kitchen by marinating in minutes instead of hours NESTABLE & STACKABLE: These vacuum seal containers easily nest and stack to save space and keep your kitchen organized EXTREME DURABILITY FOR EVERYDAY USE: Premium Tritan containers are crack- and shatter-resistant, plus stain- and odor-resistant so they stay crystal clear; they're also dishwasher-safe and bases are microwave-safe for reheat only VACUUM INDICATOR: Convenient vacuum indicator shows when air is removed from the container; containers have a powerful vacuum seal, a flexible lid with easy-open tabs, and a rounded shape that's easy to clean