Whatever happened to those metal carrier affairs that you buckled a Karrimor/Carradice saddlebag to, which then fixed to your (usually) Brooks saddle by means of two metal lugs/tabs that go through the saddlebag eyes. We used to use a toe clip strap to go round the seat post from the little leather slot affair on the saddlebag. Hope I have described this well enough for someone to see what i am talking about! Most bike shops used to stock these a few years ago. I gave my one away ages ago, to A guy who was going to start copying/making them, dont' know if he ever did.