Functional, I think?
Construction quality, materials similar to most of the other LiPo bags available.  Purchase for part of the storage setup of some 3S lipos.  More or less just one added layer of protection against a lipo incident.  During charging continuous monitoring of the LiPo (internal temp, external temp, charging rates/levels, smell, sight...) is more important than the bag in preventing an ugly situation.<br /><br />If you experience a real catastrophic lipo event this bag might give you enough time to grab whatever fire suppression device you have to deal with the situation. The bag is a bit like airbags and seatbelts in a vehicle.  Hope you never have to rely on device.  But in the event a bad situation occurs, the bag may be the difference between a major or minor loss.  Personally I wouldn't store, charge or use  questionable LiPos.  Dispose properly and invest in a replacement.
Rating: 4 stars