FOOD GRADE MATERIAL This reusable silicone food storage bag made of food grade silicon approved by FDA SGS no fillers coating BPA BPS BPF PVC phthalates or any the chemicals which can be dangerous to your health after they migrate into the food ECONOMIC Capacity 6 cups10 Liter 34 oz size 75 X9 preservation storage bags durable and reusable save money provide you healthy life style only pure silicone is safe healthy Ecofriendly nonallergenic nonreactive hygienic not toxic to environment recyclable possess long lifespan up to 30 years LEAKPROOF Designed with Airtight seal Leakproof vacuum and ziplocked container that can store all kinds of solids and liquids without spilling Hermetic seal to store liquids or solids NOTE When you start to use it for first several times the lock for the bag may a little tight sealthats for a special purpose to make the best effect of preservation MULTIFUNCTIONAL Excellent heat and cold resistant temperature resistant range 50250 can be boiled and used in microwave oven refrigerator toaster freezer dishwasher safe available in kitchen and outdoors for carrying In the beginning it might be a little hard to open but they will be loosen up a bit over time Some customers also suggest to use a brush and put coconut oil in the slider to make it easier to open and close