? REUSABLE, ECO-FRIENDLY AND EASY TO CLEAN - By using these reusable silicone bags instead of non-biodegradable zip top plastic bag, not only you save money in a long run but also you help the environment. You can easily wash them by hand or put them in dishwasher machine. ?? FDA APPROVED FOOD GRADE BPA FREE SILICONE- This certificate guarantees the silicone bags contain NO BPA, NO BPS, NO BPF, NO PVC, NO Phthalates, NO Petroleum. They are Plastic Free Latex Free. So you do not need to worry about harmful chemical leaching into your food. ? AIR TIGHT SEAL AND LEAK PROOF - No leaking liquids. You can store soups, smoothies and stew due to tight seal created by the sliding mechanism. This airtight seal silicone bags keeps your sandwiches, seasoned steak, marinades and sauces fresh for a long time. ?/? DURABLE AND MULTIFUNCTIONAL DUE TO EXTREME TEMPERATURE RESISTANCE - These extra thick silicone bags could be heated up to 482? / +250?. So you can put them in oven, microwave, steamer or boiling pot. Please remove the slider before heating. You can also put them in freezer and refrigerator because they can bare -58? / -50?. Do not worry about puncturing them either they are designed to last for years.