"Bag babies", when, where, and what?

[Skycat]

I've never seen bag babies before, at least not that I'm aware of, but I'll have to be on the lookout next time I go to Lowe's. I've found myself wanting a Den after seeing that they look like a better version of "lucky bamboo".

(Yeah, with four Phals, I don't exactly have space for another plant, but that's the same thing I thought when I got my first Phal anyway, so...)