Extra chain? I rode across the country with 12 other people. Some 44,000 bike miles between us. Not one chain issue. At most I would carry some extra links and learn to repair what you have well enough to get you to the next shop or until someone can send you a replacement. ? on the patch kit? Let's not go there again. Bring one, and some chain lube. Cannot your pedals be removed with an allen wrench? Don't see the need for a headset wrench. Wine bladder? Flask? Buy sports drinks if you need them. You going to carry enough for 6 months? Dump the seam sealant. You can buy some if you end up needing it. What are you going to pick up your hot pot with? Four pens? Seriously? In general, I cannot wait to see this load if you don't pare it down significantly.