^^Thanks for the tensioner tip, hadn't thought of that. Where did you get the large chainring? I might be able to use a BMX wheel if I had a 50+ tooth chainring up front.
^I've done worse. Military-style rucksack with four litres of water, two days (6 meals worth) of food, three portable hard drives, two knives, assorted gear (matches, batteries, radio, music player), a change of clothes, and two blankets. Total weight about 35kg. Not fun at first but possible. Still, what about a sling? So I could wear a smaller (regular) backpack, and carry the folder with a sling of some sort? Although, I would still need some kind of bag for it for air travel.