At the track, we don't use lipo sacks, but we're in the pits and there is nothing really to catch fire -- the ceiling is really high up there, the walls are cinder block, and the pits, even being wood, aren't UNDER what would shoot flames -- it would just char them up a bit. At home, you definitely use a bag as your carpet and drapes, not to mention your entire house, wouldn't take kindly to a flare.

I suggest getting an ammo box for storage at home. Throw em in there with the lid just sat on top so it doesn't lock all the pressure in if one goes off, it will let it out, just not the flames.

You really do need to store them in something that can take the flare up as they can go off just sitting in storage if they start to puff and puncture themselves on something. It's not common, but it's cheap insurance.

It's never going to happen to you, but if it does, you're gonna feel real dumb.

Wayne