I think the point is that if a random person is out for a stroll, and suspects the apocalypse is going to hit while they're out, then the chances are they'll be hardly able to stand under the weight of the backpack. But if they're just out strolling, without thought for the end of the world (shame on them), then what such a random person is likely to have in their pockets is going to vary greatly.
In some places, so I've read, there's a good chance there'll be a handgun in those pockets or handbag. Some sort of clasp knife is not unlikely, but - depending on where this person is, how they grew up etc. etc. etc. - it is far from a given. Same goes for pens, string, wire, screwdrivers. Even the apparently ubiquitous mobile phone is not guaranteed - I don't carry one when walking near my home, they don't work here.
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