Picked this up for the R1250GS as an alternative to panniers when I just want to carry more than a rucksack but don’t want to make the bike mahosive with panniers.
Fits 50 litres, has a waterproof main section, loads of high-vis reflectors and is designed to mount over the rear seat with fittings moulded fo the bike, making it look like it’ll slot on easily. Not proven yet though
Comes with carrying straps and a nice quality padded shoulder strap for lugging off the bike.
The build quality feels really high. I’ll post up some more pics once I’ve fitted it properly. Pic below on the bike is with it just resting in place.