Re: hydration pack, I got one of those CamelBak pouches with a sleeve that had small clasps (English not my first language, can’t explain better than that). With some zip ties I was able to hang the hydration pack from the top tube , it did take a lot of the space inside the frame but I didn’t mind. I had no issues with this setup, I just stopped using it because my roadie friends didn’t like it 
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