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That was just a random pic to show what was available. I have the same rucksack but I cant remember if I have a 40 litre or 50 litre liner as there are no markings on it. Sorry!
However, there are similar bags, a lot cheaper, so I just bought a...
https://www.craghoppers.com/40l-dry-bag-agave-green/?gad_source=1&gclid=CjwKCAjw0YGyBhByEiwAQmBEWh85FwUJ_eQESzMBlhNiqmETGMG6qYSCvO96KJhtEU8i2cetT3rkHhoCnRcQAvD_BwE
I use similar to this one at 80g.
As it’s a top loader it works well as a liner too
It might be cheaper to use a very inexpensive bag - maybe one from a charity shop and leave it behind at your first accommodation, then buy another cheap bag when you are ready to go home.
I was going to suggest the IKEA Frakta bag with zipper...
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