for 2up on tour we need more luggage (90% for my Girl ) , so we use an old "standard" Tank-bag - with the Y-way to fix it on the tank, thre are two screws on the front of the Tank if you open the lid ..
Outlander fairing - Fox-shock - BajaRon Swaybar - Hankook tire/ back - 165/50 Imperial tires front & longer front shocks - GIVI Topase - Shad sidecases -heated grips - new seats
Just make sure there are 'soft' things in the bag! Looks like it could act as an air bag as well! I have a bag that I attach to my FJR with suction cups at the two front 'Y'mounts. I'm thinking now that they will work on the Rally.
2020 F3L; gone but not forgotten are all the good miles!
Tank bags are not Ryker only stuff. Amazon has a huge selection in all sizes that fit most any brand of bikes. They have the magnetic and the strap mounted type. They also have a large variety of tail bags, oil change kits specially for Can Am, and many other accessories. You should be able to find a tank bag trhat will work there.