Spectra antibacterial Nano Silver Ice Pack is specially created to help you store and transport your milk at a proper temperature. Besides keeping things cool the Nano Silver Ice Pack has the feature of deodorizing, sterilizing and performing effectively against the propagation of germs. Anti-bacterial surface kills 99.9% of E.coli and S. aureus bacteria while being safe for humans Gel-type. Reusable up to 1 year. Stays cold 2-3 times longer than ice (up to 12 hours) Weight : .100kg.