I know that there has been many words about where to fix a 1-litre bottle-holder (note: not a cup-holder - that's a different and smaller matter) None of the suggestions seem to be ideal and after much thought I have come up with this solution - tie-wrap it to my backrest. Other suggested places on the 650 seem to hinder something: the knees, front locker drop down, the legs or cluttering up the handlebars. The holder itself is really made for a pushbike and has two keyholes for screw attachment as well as two slots for tie-wraps - which is what I used. It stays within the scooter area limits and is out of the way of the pillion seat which I use for my wheely suitcase on holiday trips. Oh, and since you asked - the duck head came from a long defunct umbrella handle.