I have alway worried about using my leather panniers for touring as they are fixed to the bike and completely insecure. I have just found and bought these which means you can load them up and take everything out easily at your destination, leaving just the empty panniers. You clever people probably already knew this but thought it was worthwhile putting it out there https://www.ebay.co.uk/itm/15297971...rentrq:a46ce0b51810acf048214f23fffaf088|iid:1
I got these faux-leather throwovers for 85 quid on Louis-moto.co.uk. The rear saddle clamps the adjustable centre panel in place on the bike and the bags unzip so you can carry them away like 2 small suitcases. 27L per side so they carry plenty for my trips. https://www.louis-moto.co.uk/produkte/motorcycle-leather-saddlebags/220