Safe Material: The salad dressing containers to go are made of plastic, BPA free, non-toxic and safe, lasting and durable. Leak-proof: The sauce container has an airtight plastic lid so sauces won't spill out. The design is completely leak-proof and keeps your lunch bag clean, you don't have to worry about contamination of your bento box or backpack. Easy to Clean: The round storage containers are easy to take off and put on, stackable for compact storagekeep, you can just rinse with water, or wash with dish-washing machine, which is very convenient to carry on the go. Wide applications: Suitable for yoghurt, salad dressings, sauces, condiments, fruit bits, cream cheese, sunflower seeds, dried cranberries, and nuts. Food storage containers can be used for storing fruit, bread, snacks, lunch and more. Perfect for school, kitchen, office, travel, picnic, barbecue, party, etc. Easy to carry: Each sauce container has a 160 ml capacity, which is very convenient to carry on the go. The 6-piece set can meet your small-capacity and multi-variety needs. Different colors of lids help you distinguish sauce easily.