Protect your family and home from the hazard of lipo charging. This lipo-guard is a fireproof bag, designed to stop and contain the fire caused by incorrectly or poorly functioning lipos, especially during charging. We urge all customers to always practice extreme caution when charging and never leave a charging battery unattended. This pack is the jumbo size. It is 23x30cm The LP-Guard is made from a fibreglass woven fabric. Similar to fireproof suits worn by some firefighters.