If you put the time you can make it stable even on a naked bike. I plan to take it on a moto camping trip and i put there a micro tent, inflatable sleeping pad and a sleeping bag and a big pillow just to fill it up a bit (I wanted to strap it filled). There are many straps that make it easy to secure it. I attached the front straps to the passanger foot pegs and the back straps to the plate holder. Then i tighten everything. When i put my hand on the bag and tried to wiggle it - the whole bike was moving. So yeah, it feels safe but i will chceck from time to time when riding with it.
