i never subscribed to the "bring it all just in case" mindset instead choosing to arm myself with knowledge, not gear. i was part of a core group of four guys who went on trips once and sometimes twice a month for over a three year period. the other three guys would go on expedition type trips with me joining them for our local weekend trips. when i first hooked up with them (2005), i was just getting back into backpacking for the second time with gear purchased a few years earlier (2000-2001). of the four of us, two guys carried massive packs, i carried heavy stuff in a heavy pack, and the final guy, well, he turned me onto this site. his base pack weight was around 9 pounds.
our trips would typically have 7 or 8 people, some who would do a few months worth of trips and others who we'd only see once or twice. over the years it was probably 20 different people who came and went with the core. i saw all manner of heavy packs for 3 days in the woods. i saw a very petite girl lugging a cast iron skillet that she used to cook eggs and bacon on the first day and then never use again up 1800' of elevation in 2 miles. yes, she waited for me at the top. typically a bunch of gadgets would surface in camp for a few minutes and then be put away to be never used again. one guy carried canned food, not soup or tuna, a canned ham and the large can of skinned potatoes!
during my time with this core group, i started to replace items as they "wore out" with lighter alternatives (that's the official story given to my wife). i moved to a custom pack and that is the heaviest item at just over 3 pounds. i switched to a canister stove and changed my mindset on the tent and extra clothes policy. i switched from Nalgene hard plastic bottles to 1 liter canteens and ditched the filter in favor of chemical treatments. i shed about 8 pounds by just replacing items with lighter versions – not doing without. but the two other guys in our core continued to carry tons of stuff and everything was the mega version, built to last. i thought it was insane, they knew better. if i could reduce my pack down to 12 pounds, there was no reason they couldn't do the same.
i asked one of them about one night when we shared a tent one trip. he told me he carried all that gear to keep his body in condition for expeditions. seems he did a bunch of month long adventures with massive peak climbs. the other guy was in training to do the same thing.
i made the suggestion that instead of carrying all that extra junk, why not just bring the essentials and replace the weight with water in the pack. the very next weekend trip, both guys informed us that the group of seven didn't need to carry water, they were each carrying 3 gallons. 25 pounds of water to replace all that other stuff, i was dumbfounded.