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Cut a pop bottle in half, inverted down like a funnel. Cut some flanges around the top of the bottle where you cut it in half, then just tape flanges down with some strong duct tape.
this is the perfect Yellow Jacket trap. For the bait use one inch of water in the bottom of the trap one cup of sugar water some old lunch meat and 2 tablespoon of apple cider vinegar. This idea came from Jimmy, and I from Barnyard Bees. It work perfect.