A few years ago I got a CamelBak HAWG for mountain biking. Its really well insulated, Ive had ice left in it still after 24 hours. The back is fairly breathable so it doesnt get too hot. Ive fallen straight back onto jagged rocks while trying to climb hills without harming my pack, bladder, or most importantly my back. Im sold on it as a rugged product. It has plenty of space for me to carry more than enough water, all the gear I need while Im out, and Ive even carried some of my friends stuff. It cinches down pretty well so you dont have excess baggage to get caught on limbs and stuff. This years HAWG looks even better!
Now that Ive started geocaching I just added some spare batteries and pen and paper and pocket my gps. Still carry all my biking gear around just in case I run across someone who needs it. Not like the exercise doesnt hurt.
Those maxpedition packs do look pretty cool...
