With their tiny size, bed bugs don't need much air to breathe and just enough air can be in a sealed bag to keep them kicking for months.
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Baby powder doesn't kill the bed bugs, but the talcum makes the bed bugs slide, preventing them from exiting any sort of trap. Talcum powder provides a drying effect to bed bugs which works as an eliminator, but it does not have the capacity to kill these nasty pests completely.