Is a little warm, but not bad. Nice to have the extra water on a hot day. The pack sits above my pockets and the extra space to carry my tools in is welcome. Seems good and sturdy. Wish the hose was shorter. A little pricey but worth it if it holds up.
I needed a hydration pack for a week of mountain biking in Utah. We rode 5 hours a day. The hydration pack not only held my water but I had plenty of room for my nutrition bars and my journal. Other people on my trip commented that they preferred the size of my pack over theirs!