Best Quality Guranteed. 1.MATERIAL SAFE: They are made from 100% FDA compliant non-toxic, BPA free, food grade silicone. just like the ingredients of baby pacifier. They are odorless, tasteless, non-stick, leak-proof and easy to clean. They can withstand temperature low to - 40C, high to230C, which makes them microwave, freezer safe. Great for storing leftovers in the fridge and microwavable for when youre ready to enjoy your meal. 2.VALUE - of 4 stackable and collapsible silicone containers: 1- 350ml, 2- 500ml, 3- 800ml and 4- 1200ml, From storing dried foods to wet foods, leftovers to meal prep, and indoor to outdoor, this versatile is the perfect solution for your different food storage needs. 3.SAVE SPACE: Each container is collapsible to 1/3 its original size (about 3CM after folding, saving 60% space)for easy compact storage and organization. Portable, good choice for food storage, lunch box, bento box, outdoor, picnic, travel, hiking, camping and more.