Geez, Hitt, so sorry it happened to you. Must have been frightening. I considered getting a charging bag, but then I read somewhere that a charging bag itself may contribute to the charger and batteries overheating by reducing airflow. I don't know if that's the case, but it made sense to me at the time.
I just charge my batteries and mods on a granite counter and always when I'm nearby (and preferably nobody else--if at all possible).
The bag I got has a Velcro strip but doesn’t seal airtight so it shouldn’t cause too much extra heat.