Thank youYeah, you are both right. There's certainly nothing WRONG with keeping them in larger containers and it does have certain advantages, just wanted to let OP know that there isn't one right way to do it and the slings will be fine if they don't get a super deep container.
Wow, she is beautiful! I love the look of this species, with the thick back legs, and their velvety appearance. I've been looking to get one for a while and looking at your lovely lady I'm glad I did!View attachment 122575
Here is a picture of my P. muticus. I got her as a sling back in 1999. That's a quarter next to her for a size reference, quarters are 1 inch diameter.