@CosbyArt Actually I kept my first Chinese mantis nymph in a few different sized containers with that same spider web material on their lids. He didn't seem to notice at all and would hang out in the center of the "web" most of the time to my amusement. Never really thought about it that way though. Its a good point, I wonder if they are hardwired to fear webs though usually spider webs are rather hard to see (probably why I walk through so many walking the dog every morning). Regardless I have not had any odd behavior around the web material as of yet. I'll be sure to update if that changes.
As for the size, I know they are on the smaller size as I'm only planning on keeping a copious number of the nymphs for the first few instars. I have large containers and terrariums waiting to be done up for the chosen few I keep for myself.