What is Reddit's opinion of Fireproof Explosionproof Lipo Safe Bag for Lipo Battery Storage and Charging, Large Capacity Fire and Water Resistant Lipo Battery Guard with Double Metal Zipper (11 x 8 x 6 in)?

From 3.5 billion Reddit comments

I use this large one for my 20AH battery.

(11 x 8 x 6 in) https://www.amazon.com/dp/B07Z83WGL1/ref=cm_sw_r_apan_glt_i_RPHCH68HT1977VPK9PYW

There are many safety charging containers available, for example:

https://www.amazon.com/Fireproof-Explosionproof-Battery-Charging-Resistant/dp/B07Z83WGL1

The battery type that is most often a problem is the one without case, in a silver or blue plastic foil wrapper. This kind of battery can be easily punctured and if fully charged, can catch fire.

Laptop and other batteries in a battery pack, should not be a concern, in particular when branded. The battery pack (and often even the single cells) contain protection from overcharge and overdischarge. Charging uses temp sensors. Discard batteries that are bulging or visibly damaged. Other than that, I wouldn't worry.