In most Rubbermaid containers, unless the plastic has imperfections, the crickets cannot climb the sides. In fact, I keep my crickets in a big rubbermaid container and I actually had to score up the sides with a razor to allow them to climb up the sides. I do this because when there are 1000 crickets in the bin, they have more space to crawl rather than on each other. I only score up six inches up from the bottom.

I assume you will put branches into the rubbermaid container to allow the cresties to get around and do what a crestie does best...climb. So if a cricket climbs the branch, there will b the rare case where a cricket may jump from the branch and luckily grab a hold of a hole and possibly escape...that is if he can fit through the hole. I dremel/drill my holes and sometimes use small bits that I know a cricket can't get through.

It is hard to tell you how much ventilation is enough. In the rack I just built for my ball pythons, I drilled what I thought was enough holes and gave it a test. I moved a snake into his new home and waited for her to defecate. If the feces molds, then I know that there is not enough holes. If the feces dries out in a couple days, that tells me that the ventilation is enough. Luckily on my test run, the feces dried in 2 days and she even shed all in one go. I am sure that there are other ways on how to factor what is enough ventilation like using hygrometer but do whatever works for you.

I do not understand what you mean when you say that the containers that you have seen have been w/o lids. Do you mean that they are containers held in a rack making the top of the container flush with the rack like below?

Hope this helps!

Severa

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