AIRTIGHT AND LEAKPROOF LIDS: The silicone seal locks in freshness and prevents the glass containers from spilling and making a mess in your diaper bag or lunch box. Great for wet food (like purees, yogurts, apple sauce, etc.) and dry snacks (fruits, vegetables, crackers, etc.). MEASUREMENT MARKINGS: 2oz/ 59ml and 4oz/ 118ml jars are the perfect size for babies starting to eat purees, toddlers and kids who require an endless assortment of snacks and are also great for salad dressing and condiments for adults. These meal prep food storage containers are great for at home, travel, on the go, gifting, lunch boxes, back to school and more! BPA Free: Glass is natural, environmentally friendly and recyclable. It’s non-porous, free of harmful chemicals like: BPA free, lead free, cadmium free, PVC free, phthalate free and 100% food safe. FREEZER, MICROWAVE & DISHWASHER SAFE