[mr_dove]

I'm curious how long one can expect 100 ounces of water to last (realistically).

I have a M.U.L.E. but I seldom drink even half the water even on all day treks. It seems to me that 100 ounces "could" last 3 days.

[VaughnT]

Just because you don't drink 100oz in a day doesn't mean you shouldn't drink 100oz!

I can go all day at work and home on about 25oz, but I prefer to keep the water moving and will usu drink somewhere around 130oz; this is especially true in the summer when the heat hits my polyester shirt.

There are many stories of people dying of dehydration/heatstroke when there was a near-full canteen on their hip. The morale? Water in you pack isn't nearly as effective as water in your belly.

[Pheonix]

I have a 60 oz (??) and finished it going up the first hill mountain biking last year. Ya, It took an hour and a half to go up the wall/hill but for the next 3 hours I was dying.

It all depends on how strenous the workout, how hot it is and how dehydrated you were to begin with.

[AK103K]

I agree with Pheonix, it depends on what your doing and how hard your doing it. I go through two large water bottles and a 100oz CamelBak in about two hours while riding my bike on hot days in the summer. On cooler days, I just need the bottles. I fill mine with Gatoraide too, way better than water!

[mr_dove]

damn, I can ride all day, drink just half my camelbak and still end up feeling waterlogged.

[mtnbkr]

The only time I've drained a 100oz camelback was 1) when I went mtnbiking for 5 hours in 100degree temps, 2) riding the Seagull Century (100miles), and 3) the two MS150 rides I did (late spring/early summer, temps in the 80s+).

Chris

[AK103K]

We have to ride our bikes UP the hills to here in PA, not up on the lift like you boys out there in CO. :D (Not that your flat spots aren't steeper than our mountains.)

[mr_dove]

LOL, the mountains are really steep here but I've never taken a lift. I always take the hard way. I even rode the wrong way on a trail once, it was my first time there, and 90% of it was up hill. I was too tired to ride back down when I got to the top. I rode down on the fire road that I was supposed to take UP the hill.

[444]

I mainly use my Camelback when taking courses at the various gun schools. I try to drink the whole camelback in the morning and another one in the afternoon plus water at lunch and a quart at night. Of course this is in the desert. Last year I took Gunsite's 250 class and if I remember right, one day it got up to something like 116. After drinking that much water I still got cramps.
You need to urinate every half hour or so, no less than once an hour. You can judge your level of hydration by the color of your urine. It should NOT be dark at all and the closer to clear the better.
At Gunsite, they have charts hanging above all the toilets that have various shades of yellow along with recomendations of how much water you should drink if your urine is that color.
When I am at work, I try to drink water continuously. If we get a fire in the summer, it doesn't take any time at all to become dehydrated. When you finish the fire you could ring your clothes out and have a steady stream of water/sweat.