As is always the case for me, when I brick the bag I brick it all the way up to the tool. Here are a few photos of a bag I got 4 cycles out of. Since there was some sheetrock dust in there, I didn't bother to try to cycle it again.
I have been planning on using the zip-lock bag approach. But wanted to use a heavy duty zip-lock. Some gardening products come in bags with heavy duty zip-locks AKA slide closures. Or even bulk bags of pancake batter or flour.
