I suppose it depends on where you are, and where you expect to be the next several weeks. What you carry if you're at school would vary from what you carry if you're at home, or on a CCF camping trip. Or if you think there's danger you might have to bug out at any time to go to a safe house versus all you're facing is a boring night in the common room.
Mr Longbottom always carries a wallet that has a bunch of shrunken items in it, including a two bedroom tent, two weeks of nonperishable food, a field medicine kit, baby supplies, and so on, but then he's a fugitive wizard who looks after muggleborn children who've been spirited away, so the sorts of things he needs to have at a moment's notice are rather different.
A mess kit. It's all very well to have food, but you need something to eat it on: a tin plate, maybe, and a cup and cutlery. A compass is a good idea, and so are the omnioculars, Ron.
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Mr Longbottom always carries a wallet that has a bunch of shrunken items in it, including a two bedroom tent, two weeks of nonperishable food, a field medicine kit, baby supplies, and so on, but then he's a fugitive wizard who looks after muggleborn children who've been spirited away, so the sorts of things he needs to have at a moment's notice are rather different.
A mess kit. It's all very well to have food, but you need something to eat it on: a tin plate, maybe, and a cup and cutlery. A compass is a good idea, and so are the omnioculars, Ron.