Just yesterday, I received 2 of the hydration kits from Ceepo to go on my Viper-R frames. I have 2 of the bottles, but only 1 stem at the moment. The other stem is still to be shipped out. I mocked it up on my frame, and it looks good.
The stem is 100mm length, and rather heavy. The computer mount can be removed, and a second cover that's smooth fits in its place. The straw is big, and has a strong magnet to keep it folded down. The fill hole has 2 layers of star-slit-cuts to keep upspalsh down.
Happy to answer any questions.
Team Zoot-Texas, AltRED, and Pickle Juice