I mountain bike race with one here in the Northwest and find that using the Raceback is cooler than wearing a pack, especially when I pre-freeze half of the bladder full of water. ( I fill it up half way, blow it up with air, lay it flat in the freezer so the hole to the tube is clear of the water ) Then fill it the rest of the way and have cool water and cool back.
First pair lasted 6 years of working in the Northwest in the Film industry as well as Skiing in the winter. So the obvious choice when replacement was required. While initially expensive, long run value is above reproach. DO IT. And Do it OFTEN. These pants can handle it. Jon
I took the 9 watt version to Peru in August. After a quick trip to the hardware store for suction cups with hooks, I was able to hang the roll in the window of the train. I charged iPod, iPhone using the included cigarette lighter plug and an after market 12 volt charger. I used the included multi prong adapter to plug in a AA battery charger and charge the AA's that I used. The roll worked great, took up little room and wrapping it around a water bottle in my pack gave me confidence it would not itself get crushed. Free energy is a great way to go.
Wear often, stay out long. One of my most versatile layering options. Paired with the LTW boot length bottoms, perfect in the winter. Over a t-shirt, it cuts the fall chill as the sun sets on the Spearhead concert.