I'm thinking they are perhaps garden spiders. I have never seen a just hatched egg sac, but this was definitely what it was. They weren't there, and then I opened the window to smoke 10 min later and BOOM! 200+ spider babies! So cute!
They are bright yellow and black (striped), 1mm or so in size, and look almost like little bumblebees in terms of color and pattern but they are definitely little spiders.
My parents sprayed them with raid because we do have hobos/brown recluse spiders up here, but I did manage to save quite a few of them by scooping a chunk of the web up in a tennis racket, which I set down in the weeds and grass. They are still thriving out there
Do you know what kind of spider this is?