It seems Tokyo's average temps are dropping a bit to around 30C, and it doesn't feel as humid so I am relieved.
I haven't ridden my roadbike for a proper ride in ages. Dousing in water beforehand letting wind do its thing is usually enough for short rides on the V20, but for +4 hour rides I absolutely love my system.
The material on my new 6L backpack I got is much thinner and lighter than the Deuter Road 1 backpack I was putting my ice/hydration in and wearing on my chest. This means that there is a much better cooling effect. When I was adding 1kg of ice to my 2.5L Deuter bag it was cooling me a bit, but changing to my new thinner one it was significantly cooler because the material is thinner, and there is also no thin padding. Almost uncomfortably cold, like putting an ice bag on your chest kinda cold. I rode with it twice already, and even with only 400g of ice and 2.1L of refrigerated hydration it worked very well. Next up is the 3L hydration bag which will have 1kg of ice and 2L of refrigerated hydration. I have a feeling that I might need to put a thin liner in the bag because it might cool too well. I hate to come off like that Noob "Camelback in a backpack" guy but it is so simple and dumb that it works, especially on a bent. For short rides of up to 2 hours or so it probably isnt needed.