Got this guy for Christmas. Used it a dozen or so times. Was using a big 5 special before. While it served its purpose it was time for an upgrade. This was recommended to me and it is freaking awesome. I love the 3L reservoir as I am a water hog on my rides. Also like that I could freeze some the night before and not have weird bulges in my back. Just have to remember when you freeze it that there is no water in the bite valve as I have had huge puddles of water in my trunk from the ice melting in the bite valve and not letting it close so the water just starts coming out. I actually use the helmet clip, didn't think I ever would. I have all my tools, a couple extra tubes (1 regular and 1 thorn resistant so it takes up a lot of space, but still had room to throw in my fleece when I started overheating. And room on top of that for snacks, keys, phone/gps, phone battery back up and still space! I highly recommend.