7 miles run/walk combo on Mt. Wachusett this afternoon, using a hydration pack I just picked up on geartrade.com for very cheap. The reason it was so cheap is that it was returned because the original buyer said the bladder leaked. However, when I tested it at home it seemed OK as long as I made sure the cap was on tight so I figured I'd try it out today. Unfortunately, I found out that the thing does indeed leak!! I ended up with a wet butt from it. Time to pick up a replacement bladder that holds water. The run wasn't much of a run, probably more than half walking b/c of the steep sections, but it was still a good workout. Note to self: Wachusett is not a good place to go for building mileage!