non-toxic and tasteless, safe and environmentally friendly, in line with the food contact with the standard of daily necessitiesECO-FRIENDLY REUSABLE ALTERNATIVE - food grade silicone, nontoxic with no fillers, free of coating, BPAs, BPS, BPF, PVC.TEMPERATURE RESISTANT - Heat and cold resistant, temperature resistant -58â~482â(-50âï½+250â), safely used in refrigerator, microwave oven, toaster. freezerï¼steamer,and dishwasher safe, oven or boiling water.AIRTIGHT & LEAK-PROOF SEAL - slider bar effectively seals the bag locking in liquids or solids. Leak proof vacuum and zip-locked container that can store all kinds of solids and liquids without spilling Hermetic seal to store liquids or solids, but also outdoor to keep your small items together, preventing them loss. Completely isolated from the air to enter, to achieve best preservation effect.SMART DESIGN - cup, ml and oz measurement markings printed directly on the bag. The bottom of the bag is designed to stand on its own.VARIETY OF KITCHEN USES - Store make-ahead smoothie recipes, leftover soups, vegetables, etc. Great for marinating chicken, steaks, pork and fish. Use daily to store sandwiches for lunch and snacks.Only pure silicone is safe, healthy, eco-friendly, non-allergenic, non-reactive, hygienic, repels germs and chemicals, not toxic to environment, recyclable, possess long lifespan up to 30 years.