The lipo sack will dramatically reduce the damage from lipo fires due to over charging. The bag is made of special fire resistant materials that will smother and contain lipo flare ups. This bag can also be used to transfer lipos from location to location. Lipo-Sack also offers a free replacement if your sack is used to protect you from a lipo flare up. Please make sure to still charge in a fire safe area. Although this sack will help reduce lipo fires there is still a small risk of fire as the bottom of the bag will get very hot.