My pet mantis just laid eggs...what do I do?!?

I have it in an insect container right now. She spent most of her time at the top so she laid her eggs there. But theres openings all over the top on the container! ewww I don't want them to hatch and crawl out! What would be the best thing to do? should I let my mantis go? idk what to do with the egg sack...