>>1048603Low gear of 20:28 will be more than good enough for touring. It works out to roughly 18.5 gear-inches with those 26" wheels, which is a real stump-pulling, climbing-20%-fire-roads kind of gear.
I did my first mountain tour with higher gears, and I survived (despite being hella out of shape).
Seconding what
>>1048607 has to say: Do something to the bars so you have more hand positions - I made the mistake of doing a short one-week tour on a flatbar bike, and my hands were in such agony that I found a bike shop and strapped some bar-ends onto them around the 4th day. Had lingering hand numbness for over a month afterwards.
Could be as simple as adding bar ends to your current bars - or you could replace them with something like a Jones H-loop or some butterfly bars, which would give you a plethora of hand positions but still work with flatbar brake levers.
Baja should be dry, so you probably don't need fenders.
A good set of lights is a must.
What's your overall plan? Roughing it all the way, bringing a tent and cooking gear and such? Or staying at hostels? Because that will really inform how many bags/racks you need to plan for. At the very least, you need to figure out a water solution - I suspect that frame bag you linked to will preclude the use of both main triangle water bottle cages.
Personally, if I were trying to use that bike to tour on the cheap, I'd put a simple rear rack on it, a pair of large panniers, and strap whatever else I need up over the top of the rear rack. Something along the lines of the photo attached here. A setup like this doesn't handle best (especially if you like to climb out of the saddle), but it's extremely economical in terms of racks and bags that you'll need to purchase.
