Clove hitch vs. Prussik for PCT bear bagging?

Okay, so after years of using the counter balance bear bag method, I just tried the PCT (practicing in my back yard). I'm sold–far easier. But the one-handed clove hitch tying is a little annoying.

So I tried attaching the twig to the main cord with a loop of thinner cord and a Prussik knot. Just pulled the food bag as far as it would go, then slid the Prussik up as far as I could.

It seemed to work great and was much less fiddly than tying a clove hitch–I prob. could have done it in the dark with gloves on easily.

My question is, because this seems like such an obvious thing to do, and because I haven't seen it mentioned before, there must be some problem with it. The extra loop of cord does add a trivial amount of weight–about 1-2 grams–and is a bit less "simple." And I was using a 5# test bag, with braided nylon main cord–would a lighter bag and/or Spectra line allow the Prussik to slip?

Help me see what's wrong with this idea.