Ortlieb = made in Germany
I use an Ortlieb which is probably about 1/2 of your proposed size; according to the label it's "article number" K32 of PD350 material and it is very, very waterproof + I have never managed to puncture it.
The size suits me; flung over the back of the bike and hanging in there with just a bungy, it carries the tent and sleeping mat easily, with a bit of space to spare. It's the first thing off the bike when camping and the last thing to go back on.
There is a loop arrangement at the closure end and another, less obvious, one at the closed end for fixing with bungies.
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Dave
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