I've found that nothing stays very cool for very long sitting on top of the tank. It just gets so hot up there in the spring/summer when it's hot out already. I'm planning to try a hydration bladder behind me next time....maybe tucked in a duffel on the passenger seat just to try to keep it as far away from the engine heat as possible. Sucking hot water sux!Drinking hot water does sux. I use a camel pack and love it. I keep it under my jacket and the ice does stay in there all day. It also keeps me cool. One thing to remember with any hydration unit is to blow the water back into the tube after each drink. The second drink will be very warm if you dont do this
I've found that nothing stays very cool for very long sitting on top of the tank. It just gets so hot up there in the spring/summer when it's hot out already. I'm planning to try a hydration bladder behind me next time....maybe tucked in a duffel on the passenger seat just to try to keep it as far away from the engine heat as possible. Sucking hot water sux!This is where packing for multitasking helps out. I use my insulated jacket liner to wrap up the bladder full of ice water, it generally stays at least cool all day. The liner also functions as a pillow, and of course a jacket liner. One item, three uses. Helps make room for the fold up lawn chair and beer cooler that I carry.
I just got my bag for motorcycle tore also but I elected for one not pack specified. Ended up with this one http://www.motorcycle-superstore.com/1/4/71/2521/ITEM/Fieldsheer-Contour-Tank-Bag.aspx. which is large enough to pack a hydro pack. I think FOR ME the only reason I don't use a pack yet, is because when I think its time for me to get a drink in the heat, it's time for me to get off the bike and stretch my legs too and a potty brake. In the heat I usually un arse the bike once every 60-90 min.
Cheers
Ron