I've sold my RT and the Tank Bag doesn't fit my new bike and has to go. It's the BMW Motorrad R1200RT bag complete with fittings and instruction manual. You will have to provide a piece of self adhesive velcro for the attachment point though.
This is fully waterproof and doesn't need a cover as with cheaper models (Givi etc). I expands to half as big again is ideal for day to day or touring use.
It is in good condition but has faded a little (all Motorrad gear seems to do that!) and is now a dark bluey purple if you look closely.
How about £80 delivered - UK only. Paypal friends and family.