Recently, Boy from Netherlands sent me pictures of one of rare Kriega bags I don't own - Kriega Rally pack, on his Husqvarna 701 with Perun moto Luggage rack. It requires drilling two additional holes on the rack, but it fits great!
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.