The what I learned posts; You can take it with you.
Well some of it anyway;
Once you have your bike it should be fitted with luggage. I am totally satisfied with the Givi three bag set up I had on the KTM. The de rigueur adventure look requires those boxy aluminum 'I made it myself in shop class' cases. If you like em, more power to ya, but I don't and here's why.
Square metal edges can do a lot of damage to whatever they hit (including el piloto).
Lid style covers means the whole bag needs to be emptied to get whatever is on the bottom. This is important, because you need to pack the heavy stuff (tools) on the bottom, and they may be what you need access to most often.
They are generally not easily removed from the bike. This is important because you may need to remove the bags to get your bike unstuck, get your bike through a narrow doorway into the hotel lobby, or be able to take your bags into your room. All three of my Givis are off the bike using one key in less than a minute.
Givis are also very strong, nearly unbreakable, and because they are made of ABS plastic, the same material used for most car bumpers, if you do manage to crack them, they can be repaired at most body shops, or you can learn how to fix them yourself, it's easy.
Another good choice is soft luggage, but only the kind that is 100%, throw it in the river and it comes out dry waterproof. The last thing you need to find after riding hours through cold pouring rain is that you have no dry clothes to change into.
Whatever you choose, the good stuff is going to cost more and is definitely worth paying for. Beware of shoddy knock offs selling for 1/3 the price of the real thing.
This is no place to cheap out, consider buying quality secondhand luggage before wasting money on poorly made imitations.