[Rio]

I have used one like this:

Cut-off top of two-liter bottle inserted back into the lower half. For bait, I have had good luck with Mountain Dew. Can also put a chunk of meat down there. A drop of soap helps drown them quicker.

[AnAmericanAbroad]

I’ve used that; I used a little RC Cola as the bait, with a little liquid soap. Worked great.

[Envisioning]

A drop of soap helps drown them quicker.

I want them to drown slowly and painfully.....LOL.

[MUDDOG]

Thanks!

[SpaceBar]

That 2-liter trap will work with flies also if you use a piece of putrifying meat and water as bait.

[Hot Tabasco]

Pesky bee ping........I like your idea!

[Mr. Jeeves]

I've used the commercial versions of that - the problem is, although they drown the yellow jackets effectively they also seem to attract every single yellow jacket within half a mile. So rather than one or two in your yard all of a sudden you have a couple hundred buzzing around, making their way toward the trap. And in Northern California, there always seemed to be a limitless supply...

[Bigg Red]

Excellent. Thanks.