I was never really over lightweight standards, even as a Scout my base pack weight was about 20-22pounds. I read a couple of good old school books that taught to count the ounces and the pounds would take care of themselves :-)
However, one trip to SW Tasmania a long time ago now (2005), I ended up with 35kg inc food and water. That was about 16 days of food (trip ended up being 13 days). Not so bad, I was really fit. It was fairly standard Bushwalking Gear in Australia for those conditions. Included a ~3.4kg One Planet Expedition Rucksack (up to 100L). Anyway, the worst part was that one of the other three guys on the trip hand't been in a big bushwalking trip for a while. He was a bit older. He packed a rediculous amount of food. I mean rediculous. Several 1kg blocks of cheese kind of rediculous. Hey, the food on that trip was great! But the first two days on the relative flats through the Peat Bogs (swamps) of the Arthur Plains, right from the start, there was no way he could carry it. He couldn't even fit it in his Macpac Torre, he had it in two sail bags of ~25L each with cord between them, trying to drape it around his neck. Must have been a good 6-7kg per bag.
So after 200m, I took out some and jammed it in my pack, to the brim, then I had to carry those bags, now about 4kg each too. I was probably hauling in excess of 45kg those first two days (I did drop a couple of litres of water as I realised exactly how wet it was down there…pnly ever needed a pint at a time, max) until we reached our food drop point. And I was eating like a pig the whole trip.
That trip absolutely confirmed me that I wanted to change ways and go ultralight. I had been reading BPL for a couple of years by that point (from very early days of the website), and it was hard to reconcile the knowledge and gear on BPL at the time against the Australian experience and Australian conditions. Being a student too (My God I still am…) I couldn't afford to just buy all new gear when I had gear that would last a long time. For example, an UL pack at the time like a GoLite Jam or a GG G4 would have been torn to shreds on that trip in the first day of scrub, plus wouldn't have been able to carry two weeks of food. On the walk out from the Western Arthur Range, I did a lot of mental arithmetic though, and figured that if I ever got the chance to return there, on that trip with a group, my base weight would be 6kg, including a tough rain jacket and pack to deal with scrub and scrambling (Poncho up the direct ascent of Federation Peak is probably not a good idea…neither was a pack made from 30D sil).
With a 6kg base pack weight I figured I was more than capable of carrying in a whole months food and doing some rather serious, long trips into the Wilderness. Yet to have the opportunity to carry it out…it will happen :-)