Not to be the non-safety supporter person but most of the time label batteries if you charge them properly and they are not damaged are not going to blow up. And if you're charging batteries you should always be watching them to make sure that they're not blowing up or smoking or something. You shouldn't plug them in and go for a drive and come back hoping nothing happened. I have two charge bags but honestly I never use them. Usually keep a close look out on my batteries when charging and if any battery is puffy or looks like it might be damaged I get rid of it. I store mine in a $30 metal tool case from the tool store but I cycle them every four months so I get a look at them to make sure they're OK. Obviously the charging bag is a good safety precaution but I think most of the time when people blow up batteries is because they overcharged or charge to fast or had a damaged battery that should've been discarded