Sorry, I don't have any experience with the Henty.
As far as hip-belt hydration packs, I use a Scott fanny pack with a 1.5l hydration bladder. It also has storage for tools and miscellaneous items.The bladder isn't huge, but about as big as you will get for a fanny pack. It's a good bag. Just another option to consider.
https://www.scott-sports.com/us/en/p...ifier-hip-belt