Just FWIW, I much prefer my Hydrapak set-up over my Camelbak.
That's fine, but for about the same price I can get a much stronger reservoir. The thing I personally don't like about the Hydrapack reservoir is the seal on top, which is prone to release easily with too much pressure on the reservoir.
Check out the videos here, in which this guy tests the main reservoir from each brand fr durability.
Unfortunately, the Hydrapack did the worst in the test.
It just burst open the second he dropped the first bag on it.
I'm worried that the same thing would happen with mine if I were to slam on my back.
That's why I'm asking if the Camelbak Antidote mouthpiece fits inside the sleeve on a Dakine pack, because overall it did better than the others (the production version in the 2nd video- the one in the first video was a prototype so he later tried the final product to be fair).