- SAFE, STRONG, DURABLE: Our collapsible storage containers with airtight lids use high-grade silica gel, vacuum sealing, BPA-free, non-toxic and tasteless materials. More crack-resistant and degradation-resistant than plastic. Save money and protect the environment. Ideal for food storage in kitchens and RV storage and organization. Also suitable as inside RV accessories. - MICROWAVE, FRIDGE, FREEZER & DISHWASHER SAFE: Handles temperatures from -20 C to 200 C. No need to replace flat box stacks. Leftovers can be transferred into these containers and stored in the fridge again. No wasted space, no extra containers, and less washing. - VALUE PACK: Includes four silicone folding bowls that are elegant, fashionable, compressible, stackable, and reusable. They seal well and collapse easily. Sizes: small 350 ml, medium 500 ml, large 800 ml, extra-large 1200 ml. - CONVENIENT DESIGN: Snap-on lids form an airtight vacuum seal to keep food fresh longer. Vent for microwave heating and four convenient sizes make them ideal for meals or lunch boxes. Leak-proof design suitable for indoor and outdoor storage, work, camping, hiking, travel, and more.