Lots of good comments so far. +1 on the water filter and multi-fuel stove. White gas, kerosene, diesel, unleaded auto gas will likely be easier to come by where you are going than alcohol, and they have more BTU's. MSR makes a great multi-fuel unit. My favorite backpacking stove is the tiny Snow Peak unit that takes the iso-butane/propane cartridges, but those may not be readily available, and don't work as well as liquid fuels when it's below freeaing. Water should be plentiful up to and including Alaska, good to carry some, but also be able to make as much as you need in some circumstances. If your bike cooling system springs a leak, you may have to use your drinking water to get along. You'll need to make more. When I back-pack, I always put a Space Blanket in the tent, silver side up. It reflects a lot of heat and keeps my tent several degrees warmer as well as making a great vapor barrier, and survival wrap if need be. Get a good hatchet and forgo the mallet, save weight and space. I try to make as much of my stuff "multi-use" as possible. I like the curved, "nesting" type of aluminum tent pegs, with the lightening holes in them. In snow, the holes let the snow go through and refreeze, which helps to hold them in. LED head lamps are the
greatest invention ever. I have five, keep one in each truck, one for shop use, one in my "bug-out" bag, one for backpacking. I HATE trying to hold a tiny flashlight (or worse yet a 3-D-cell Maglite) in my teeth when trying to repair something in the freezing rain at midnight. A good full-size Leatherman tool can be useful, but won't be a substitute for a full toolkit. I have a Wave, and a Sidekick. Another BIG +1 is a comfortable sleeping arrangement, pad, air mattress or whatever you prefer. I love my Thermarest, but they are spendy. Whatever you decide on, use it for a week or so at home, and make SURE it's what you want. Lack of good sleep is a very bad thing, makes the whole trip more tiring, aggravating and dangerously fatiguing. Good earplugs. If you don't use them now, suggest you find some you like and get used to them. Noise is fatiguing and a looooong day in the saddle can make you really wacky as well as the hearing damage (but that's a whole 'nuther thread).
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