This is Samantha aka Sam.....with her egg sack. She is a rather large Wolf spider and is our Office Mascot.(I work for a pest control company). The Techs in the field bring me specimens they find and I turn them into pets. Last spider was a Black Widow and she lived in captivity for about a year. When Sams babies comeout, she will carry them on her back until they are ready to set off on their own....at which time I will free her and her babies. Dont think the screen top will contain the babies.lol