1Made Of Food-Grade Silicone And Eco-Friendly Material, It Is Bpa Free, Non-Toxic, Tasteless And Safe To Use 2Fully Collapsible To 1/3 Of The Original Size When Not In Use, And All Can Stack On Top Of One Another 3It Is Not Easy To Deform Or Melt, And It Can Be Used In The Refrigerator, Microwave Oven, Dishwasher 4Clip Lock Lid To Keep Your Food Secure And With Air Valve On Lid As An Option Of Air Vent When Using In Microwave 5Easy To Clean, Lightweight, Portable. Perfect For Food Storage, Easy Carry To Office, Camping, Hiking, Picnic, Etc