Thanks for the freedback - has anyone tried the rear frame bags it looks like they may be a pain for a pillion - more money!!!
Yes, I have them. Read the buyers' comments because there are many that supply the same thing. Some are better than others. I certainly gave feedback! I almost binned them because the holes did not line up by a long chalk and you can't believe how stiff they are! They will not stretch.
So I put the first one on, the left one, and it was such a struggle that I decided not to put the second one on at all. More than that I almost threaded the receiver nut on the frame because it just would not go in straight. After a few days I had a go with the other one but this time I softened it with a heat gun (you can use a hairdryer if you don't have a HG). It was better, but still not great. I did get it on and didn't come so close to threading the nut, but even so.....
I can't answer the question about the pillion because my wife doesn't like the GS as we've toppled over twice. Once she almost broke her wrist and another she almost got her head runover

. I'm away from the bike, but when I get a chance and if I remember (won't be home until May) I will sit on the back and let you know. I did look at it and wonder the same but stopped short of hopping on the back to check. It looked to me as if they would probably not interfere.
Are they useful? Yes, I think so. As I've mentioned on another thread I rarely do day-rides, If I'm out on it, I'm "out-out" so I tend to carry basic get-you-home tools for me and/or others and the odd spare bungie or tie-down. Allegedly they aren't, on their own, waterproof, but they come with a waterprrof bag. I sprayed mine with loads of Scotchguard and keep the tools wrapped in ziploc bags rather than use the big old bag they supply. I estimate that I carry about 1kg total of stuff between both, but they are rated (allegedly) to 2kgs each. I seriously doubt they would hold 2kgs of stuff and stay on, though because there is only cloth around the holes, there's no reinforcement. It's no bad thing to try and keep as much weight as low down as possible and they help do that.
I imagine (I hope) that when they come off for the bike's deep clean at the end of the autumn, they will have molded themselves into shape nicely and that's when I will reinforce the holes with something.
Ride safe
