Bike
What bike
Travelling by bike can be done with any bike. Essentially the bike choice is determined by the ground surface you like and/or expect on your trip. There is a continuum between rocky terrain and smooth asphalt, and bike types correspond with that. From rocky terrain to asphalt:
Suspension mountain bike: preparing for the most rocky terrain.
Hardtail mountain bike: still solid for rocky terrain, but faster on the road.
Gravel bike: most allround, tires of a mountain bike, handlebars and geometry of a road bike.
Endurance road bike: tweaked for comfort.
Lightweight or aero road bike: speed and/or low weight is all that matters.
Choosing any bike can be seen as a trade-off between comfort and speed/weight. As I like road bikes and asphalt, but do occasionally encounter gravel, I use an endurance road bike.
Endurance vs other road bikes
Road bikes generally come in three versions per brand: focused on comfort, lightweight or aerodynamics. The ones focused on comfort are called endurance bikes and are meant for long days in the saddle. When bikepacking with a road bike this is generally a good option.
Typically endurance bikes feature an inclined top tube, giving more sway to the seat tube. It's geometry allows for a more upright, comfortable position, and the tire clearance allows for relatively wide tires. At the same time it keeps a lot of the stiffness and speed that we like about road bikes.
Tubeless?
Personally, I'd always choose a tubeless setup, while bringing one spare inner tube for an easy repair. Advantages are lesser weight, but more importantly: you hardly ever get flatties. My setup has gone through nearly 11.000 km (since buying the bike) without a single flat tire.
Electronic shifting?
The butterly smooth shifting sure is tempting and probably worth the added expense today. When biking in desolate areas however, you might have more confidence in fixing an issue with mechanical shifting (by yourself or the local bikeshop). This was my consideration when buying my bike.
Handlebars?
Attaching aero handlebars (you have them for 50€) might be worth considering. The main reason is to have yet another hand position available to relax other muscles, and to have an even faster setup. For some it's also a comfortable position, especially when the bars are raised and inclined. For me it's not however, and for next trips I'll gladly drop the added 400 grams.
Bike I use
Model: Giant Defy Endurance 2023
Group: Shimano Ultegra, disc brakes, mechanical shifting
Tyres: 30mm, clearance for 35mm, tubeless
Bag setup
10 years ago, there were hardly any brands producing specific bike bags. Now, there is a whole range of specific, even custom-made bags allowing you to really tweak your setup to perfection.
Considerations
Packing your bike is a trade-off between comfort while riding (light setups) and comfort while not riding (heavier setups). This sweet spot could well be different for everyone, so there is no single best setup.
Generally there are 2 main considerations when packing stuff on the bike.
Pack heavier stuff lower on the bike (such as the frame pack) to keep the center of gravity low and increase stability.
Keep stuff that you might need frequently throughout the day accessible (water, food, rain jacket). The frame and top tube bag tend to be more accessible.
No (big) backpack
Wearing a backpack on a bike might be tempting, but is generally not a great idea. On a back that is already in a naturally bent position for hours, wearing a backpack results in back ache easily. I found an exception to be something like a camelbag, or any small bag that sits high on the back.
Four bags
Personally I use a pretty fast and light setup, allowing for a single saddle pack (rather than heavy paniers on the side). A setup like this includes:
A handlebar pack: here you would store somewhat light stuff that you don't need all to often, like spare clothing.
A frame pack: here you would store heavier things (low center of gravity), as well as things you need to have accessible. Examples are: electronics, sunblock, rain/wind jacket, snacks.
A top tube pack: obviously here you would store small things you need often: phone, wallet, airpods, etc. When stopping at supermarkets, this is the only bag I detach and bring with me.
A saddle pack: here go the lighter stuff that you don't need all to often. For me it's the sleeping system (tent, mattress and sleeping bag) and chair.
Brands
On a budget, the handlebar pack and saddle pack could well be a simple dry bag, strapped to the handlebars and saddle rails respectively. Today many brands offer dedicated packs, such as Apidura, Ortlieb and Restrap.
Setup I use
Sleeping System
Considerations
Also here, choosing gear is a trade-off between comfort while riding (if choosing light) or comfort while sleeping. The lightest tents are rather tarps and don't provide you with the most comfortable sleeping conditions.
I like to store the whole sleeping system in the saddle pack at the back. Reason is, the sleeping system is relatively bulky but light weight, and it doesn't need to be accessible during the day.
Sleep setup I use
This setup is relatively light, while still having an actual tent, a relatively thick mattress and even a pillow (by some considered a luxury item).
Tent: Nemo Hornet Elite Osmo 1P - 840g
Mattress: Themarest Neoair - 430g
Sleeping Bag: MLD Spirit Quilt - 650g
Pillow: Sea to summit Aeros - 80g
Chair: Helinox zero - 530g
Two features of the sleeping system I like:
A tent with inner musquito net and outer rain shell. When forecasts are not rainy at all, I like stargazing and setup only the inner musquito net.
A quilt that can become a sleeping bag with velcro, to be a bit more adaptive to night temperatures.