I am having a bag made with M3W embroidery on each end. A bit like the one on Carerham Sevens. It holds with Velcro to roll bar.
It will take about three weeks. Roll up tonneau and fit in umbrella maybe a couple of other things .
I’m needing to plan for Isle of Man trip in August

Do you have a luggage rack? Or will your bag be directly fixed by those velcros to the roll bars and lay over the body behing?

WIth luggage rack I made these bags https://www.speedymarmots.com/hangar-works-10-luggage-set/

I improved it a little with a couple more straps. See this photo.

I might be a little concerned following Donaldosaurus! A friend of mine touring Spain on a bike arrived at his hotel to find that his luggage was no longer on the bike!
Not sure velcro is the best choice. The heavy duty version is rated to hold 1lb per square inch up to 10 lbs. So I wonder what force would be applied to it with the wind whizzing by? Also, with time, velcro loses it’s grip due to dirt building up. At least one secure buckle type or hook type strap would be far safer for other road users and for your peace of mind, not to mention your bank balance in the event of a claim.

Big thing when touring is easy access to the fuel filler - having to unpack/repack the rack in a busy fuel station is no fun so easy on/off is a good thing - how do I know this??

We ran an 80litre waterproof GIVI fore & Aft then decided to attach it athwart-ships which allowed us the fuel tank access we required.
The bag is perfect against the elements and bungees to a fold up trolley for ease.

Just bought x2 Boeing bags which will attach independently so we’ll see how they go - Love marmotas set up just would worry about leather in the rain.

I just lift the rack off completely with luggage, to fill up.

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We bought a backpack rain cover in Decathlon. A nice quality one with elastic, straps and fully waterproof. And amazingly it looks like made on purpose for the size of our bags! It doesn’t take much space and it’s easy and fast to put over the two bags and secure with the straps.

This one to be more precise https://www.decathlon.es/es/p/funda...3501?mc=8514546&c=AZUL_AZUL+TURQUESA

And it's just 15 €!

Your rack must fit a whole lot better than ours. No amount of adjusting seems to get it to fit well and don't feel inclined to attack the roll hoops further...

JMD - lighting truss clamps work really well and allow quick and easy removal of the rack without the need to drill the hoops.

I’m pleased with this. Good quality and service. I’ve umbrella, inside rolled tonneau and Mulfab wheel spanner. Room for waterproof leggings etc.

Custom upholstery creations