This reusable silicone food storage bag made of food grade silicone and it's totally safe for food storage.Designed with Airtight seal, Leakproof vacuum and zip-locked 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 seal,that's for a special purpose to make the best effect of preservation. Excellent heat and cold resistant, temperature resistant range: -50℃～+250℃, can be boiled and used in microwave oven, refrigerator, toaster,freezer, dishwasher safe, available in kitchen and outdoors for carrying. Your logo can be printed on the blank area. Please feel free to contact with us with item number for any further information.