Fun notes on packing: It's amazing what you can fit in the smallest spaces if you do it right. I was in the Boy Scouts (of America), and we had NYLT (National Youth Leadership Training). I referred to it as 'Boot Camp for Boy Scouts' because it was 110% marching and sweating and marching and then more marching.
But the leader was this grizzled 80 year old guy. We had no idea who he was, and he comes marching out with a backpack a little bit larger than a fanny-pack.
We're sitting there with our large metal framed backpacks, packed with all sorts of gear we figured we needed. He took off his backpack, unpacked everything, and he had a month's supplies of clothes/survival gear/knick-knacks.
Then he made us throw all of our stuff away
Turns out the guy climbed Everest too. Must have been a Highlander or something.