Recently I received photos from Aurélien from France. He equipped his KTM 1190 Adventure R with Perun moto Side Carriers. And he tied SW-Motech Drybag 80 (8 liters) to the Side carrier. Bags of similar capacity (5-8 liters) are perfect match for Side carriers.
Perun moto 790/890 Luggage rails were designed as a platform for small bags or Tool tubes. In several months of use, some bags proved to work great – Kriega US-5 Drypack, Mosko moto Fatty Tool roll and 4l Drybag. Standard size Tool tube proved to work great too.
KTM 690 Enduro R is redesigned in 2019. Tail section of the new model is different than on previous models and it is much more suitable for rack-less luggage. New Mosko moto Reckless 80 "Revolver" (or simply "V3.0") is a great choice for 690 Enduro.