I do a fair amount of rock climbing too. In fact, rock climbing and mountain biking (my other primary warm weather hobby) are two disciplines where extra weight is strictly forbidden!<br><br>For rock climbing, I carry a Spyderco Delica, Fox40 Whistle, Space blanket, always wear a hat or helmet, shades, some kind of LED light (photon or Tikka) and a sparklite. Thats about it! <br><br> For multipitch, remote climbs The second will carry a small pack (like a Camelback Hawg) with 2 liters water, potable aqua, two very light tyvek wind breakers, two synthetic vests (Patagonia Puffball), two wool watch caps, cell phone, first aid stuff, approach shoes and maybe a Bivy sack if in late fall or early spring perhaps in Linville Gorge.
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Two is one, one is none. That is why I carry three.