The heat should hard boil the eggs. If you step on them and crush the "bag" you'll pretty much ruin their day as well. Although they can crawl a ways, the hatchlings prefer to travel by air with a strand of silk, so making them earthbound limits their spread as well. If it were me, I'd step on them and put them in the compost.

tj

As long as the temperatures where these insect nests end up in the compost pile are hotter than about 120 degrees which will cook any insects in the bags there will be no problem with composting them.

Good! Thanks for the advice--especially since that's just what I wanted to hear. :)