The cheaper ones do work well. I've got a few of them.
However, the Ortlieb ones are about twice as thick and made of a thick almost Vinyl material where the cheaper ones are not. They all keep the water out just the same but I've found the cheaper ones tend to wear thin and start failing where your straps are or where they're dragged along the floor etc.
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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