In reply to BStar:
From the book High: advanced multi pitch climbing -
"I weighed my kit. All the items were relatively modern, even the heavier versions, and the lightweight ones not the lightest possible, so it probably represents what might be found on most racks. Here are my findings:
•A older trad rack might weigh in at over 4.3 kg (91⁄2 lbs), while a state-of-the art one at only 2.7 kg (6lbs). This difference is greater than an additional set of wires AND cams, i.e. you could take two sets and still be carrying less just by buying lighter gear.
•The snapgates weigh more than the cams and three times as much as the helmet.
•Lightweight versions of most things, from harnesses to cams commonly weigh 20 to 50% less.
•Over a whole rack the difference averages almost 40%.
•This creates a difference of 1.6 kg between the two racks (including the helmet and harness) - i.e. equivalent to carrying a full 1.5 litre water bottle.
•A harness, helmet, large cam and a set of wires weigh approximately the same as each other.
•4 sling draws weight only 40 g more than 4 very short extenders-less than the weight of one more extender (with carabiners), and far more useful.
•If we add in another set or wires and cams, even with lightweight versions, we might add over 1 kg. This might bring the total weight up to 5.3 kg. This is a lot of weight to be climbing through overhangs with.
•Including a cordelette with carbineer might add another 220 grams; four unnecessary locking carabiners 160 to 300 grams; a nut key with carabiner for the leader another 90 grams. (Whereas a potentially very useful wind proof might only add 65 grams – not much more than a screw- gate.)"