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^^ same as olibob (assume a Velocity pack), but I sewed a clip and webbing on instead, as the Velcro gave up. Still waterproof after a decade.
Occasionally use an old Alpkit Gourdon, but that’s losing (lost) its proofness now after years of use.
For separation of stuff, I use stuff sacks and other inserts, as I find it more flexible and I can also use them in my panniers.
Edit: Just remembered a guy a couple of desks down at work uses one of the Decathlon waterproof roll tops. Seems decent quality and reasonable price. Could be an option?
What waterproof bags are people using? My Oxford Aqua rucksack has developed a few holes and needs replacing. I would ideally like something with a couple of pockets (internal or external) because I only have one tiny one at the moment that barely fits anything.