Watch the hose. Today, the bite valve caught in my wheels and was ripped clean off -- I failed to notice. Because the bottom of the hose was lower than the bag, siphoning action drained the entire bladder. Miles later, I discovered I had no water more than 20 miles from home on a hot day. I don't make a practice of begging, but I made an exception today to fill the bladder. Made it home just fine.