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The North Face Prophet 65 Backpack - 4600 cu in
The North Face Prophet 65 Backpack mirrors the natural movements of the body in motion, providing a lightweight and efficient full suspension that comfortably carries heavy pack loads. The carbon fiber stays are 40% lighter than aluminum, engineered to let you go further, faster. The Maximum Surface Area Backpanel evenly disperses pack load over the entire surface of your back, keeping fatigue to a minimum. An extended storm skirt can be used to convert the pack into an emergency bivy.
$248.95 
Great pack!!
This thing weighs almost nothing. It adjusts easily, and the adjustments make a noticeable amount of difference. You can fit quite a bit into this bag. The hydration pouch seems a bit small, so make sure to test-fit a bladder before purchasing one. There aren't really any secure external pockets, which at first seemed restrictive - but it forces you to pack better, and keeps the bag very simple.. I now enjoy the lack of pockets as a feature. This is great for any weeklong light adventure. The description mentions some kind of "emergency bivy", but I don't have any clue what that's talking about.
North Face Prophet 65 Pack
Awesome pack! Extremely expandable, took this one recently on a late April ascent of Mt. Whitney. The pack held everything tightly. I loaded 60lbs of gear in and on it without any issues. It carried my snowboard very well. The integrated Hydro-compatibility is a real plus. Would recommend it for anyone that wants a serious do anything pack! Happy Camping! - Kevin
hmm...not that great
Used this pack on the west rib of Denali last year. Yes, it's light, but it does not carry loads well, the waist belt is pretty flimsy and most of all, I didn't think it carried enough. I’ll try it out in the Karakorum this year, but will be taking an Osprey Aether 90 as a backup.
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Training Tips
Cross training gives your body a chance to recover while still exercising. If yesterday has a hard run day up and down hills, then today's bicycle ride gives your aching knees a well deserved break.
Anaeroic threshold is when lactic acid starts to build up in your body as your muscles are not getting the oxygen they require. This threshold is typically expressed as a percentage of your VO2 max - the amount of oxygen per kilogram of weight that a person can use in converting fuel to energy. Elite athletes threshold might be as high as 90% of VO2 max.
Efficient running position allows you to run farther and faster. Keep the heel raise to a minimum, relax your upper body and hands, keep your upper body poised and quiet.
If you want to make progess in your training, join a running group. A commitment to meet on a regular basis with a group of like minded individuals will help you keep your focus.
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