I have 189 skis, so ca 200cm length is about right. You can fit short skis in a longer ski bag but not vise versa... I think the trend is to use a ski bag like a suitcase, with clothing and shoes stuffed with the skis to provide padding and cut down on the number of luggage pieces. So the game is about two things: protection and weight. Kulkea seems decently protected, didn't see enough details to evaluate that however. The weight is a total unknown. My current favorite travel bag is the Thule double roller. I also have a DaKine double roller bad that has been truly bomber for many years, but it is heavy. Thule seems a bit less bomber but it is quite a bit lighter. They are also pushing the idea of another bag that you can clip onto the wheel end of the bag, but I don't know how practical that it.
If you have shorter skis and are conc3rned about sagging, buy a snowboard roller bag, same design, but shorter, which would be just about perfect for a 170 ski.,
So, again, the idea is to put all your stuff in a ski bag that you check, and then you carry on just your backpack and boots. Then you carry the pack on your shoulders, boots over the shoulders, drag the roller pack with one hand and have the other hand free to open doors (and write PugSki posts while you walk).