I have an ex-army kitbag and a (4m) I think, Kryptoflex cable and lock. Stuff my, erm, stuff in the bag then wrap it up with the cable (like you would string up a brown paper parcel in the old days. Stuff that under the bike and lock the cable.
You can get woven wire mesh bags to go over rucksacks but to be honest they'd easily be got through with a pair of little side-cutters.
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