Well that makes it easier to wash her hair in the sink I guess.
But also, hear me out, what if instead of that plastic thing she had a quick release hook, so she could use the tail (and the hook) for self defence? Hell, make the tail of braided leather and you got a cool whip for impromptu BSDM session!
The fact that there’s no way to open those. The only way to remove them is to untie them from the hair on the head, and I doubt that a good yank it’s a) enough (without ripping out hair!) and b) advisable
What if instead of a quick release hook there was a rubber o-ring on her head hair and a buttplug-shaped object on the ponytail.