Yeah HHH this year was incredibly mild. I hadn't even gone through 1 water bottle by mile 40. It did warm up about 20 miles later, however, but it wasn't bad at all. The fact that there are rest stops every 10 miles should probably mean that no one wears a hydration pack.
I will say though that there were so many water bottles laying on the road from dummies who couldn't figure out how to put it in their bottle cage that maybe hydration packs aren't so bad of an idea for some.
Did see some weird stuff on that ride...