I bought a used pair of Happy trails denali panniers off of ebay. They worked great on my DL 650 on my ride through South America to Brazil. They were water tight and were welded nicely together.
If I hadn't gotten such a good deal on these panniers I was planning on buy a pair of those chinese panniers (Tusk). They are cheap and I think would have gotten the job done too on a budget.

Sent from my SM-N910V using Tapatalk

seen all kinds and i am purchasing a new bike next year 850 bmw
my current bike is a f700gs with motorrad panniers and givi 42 outback trecker top box all is fine but i don't expand the side panniers for a lot of reasons drag is one ,beyond the handlebars is another, i live and ride in Colombia and you have to watch your 6 all the time its a pain in the ass.
Givi 40 l waterproof bag is the answer on the back seat for long hauls i keep all my clothing in this bag 2 bungees and secure and many more options to secure stuff to the givi outback
all being said i think it is personal preference what is right for you
The new 750 / 850 bmw has a different frame and the exhaust is on the rh side so i a sure bmw has panniers for the beast and they probably look nice and fit nice, but i am going to build my own
I am a aviation sheetmetal tech and have a lot of experience with carbon fibre composites, yes this is the real deal 2024 T3 aluminium alloy is incredibly strong and fairly easy to work with if you have the right tooling and lots of experience
all the aluminium panniers available on the market use commercial aluminium and by nature is commercial it is not Aeronautical it is easy to bend easy to fix but is not strong, for example thickness .040 2024 t3 is twice as strong as .080 5056 commercial aluminium and half the weight . aeronautical aluminium become stronger when it is bent or formed in a stressed skin or monocoque design,there are tricks to the trade, stronger lighter its aerospace and its not cheap But i work in the trade so it is for me
Now the final frontier carbon composites stronger than all of the above and lighter but you need special tooling to make it happen
I am waiting for the bike to come to the market in Colombia and will start my process on making luggage