Enlighten me please. Are you using the bag to charge or putting battery in bag after charging. Or put battery and charger in bag while battery is charging?
If I'm storing charged batteries in protective plastic case what's the point of the bag?
I put the charger in the bag and seal it up while the batteries are charging. In the event anything goes wrong while charging, any spark or flame is - in theory - contained within the bag.
Once charged, I do the same as you - I store the charged batteries in protective plastic cases until I need them.
Here's a quick pic. I just popped the charger in to show how the bag is used. You can (hopefully) see the bulge of the charger inside, with the power cord coming out through the top of the bag and plugged into the wall socket:

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