I have only recently come to bikepacking from road bike use / audaxing and am new to posting here I adapted my Trek madone to take panniers for long distance self supported travel by road to places like Madrid / Mt Ventoux etc - Carbon fibre bike no attachments for the rear rack but a Tubus axle ada...

Not posted on this forum before but I would like to buy one of the Airlok xtra13l drybags please ideally chilli
How do I arrange payment and receipt?