a few years back i climbed up mt cuerno (17000ft) in winter alone up and down 80% ice,with no ropes, in a developping snowstorm, with 1l water and a bar.what i brought was 2;40 marathon fitness, acclimatisation to 22000ft, sharp tools and some faith. what we bring is always relative. another time i was climbing mt washington (6000ft) with 50 lbs of gear and got blown off, spent 5 days out until choppa came......i had to pray , but it came... gear,prep,etc is no garantee .