Easy school lunch ideas?

I'm looking for QUICK lunches i can whip up before bed and stick in the fridge for the next day. I'm in high school so that means i have to have my lunch sitting in my locker for roughly 4 and half hours. I really don't want to eat just the same pb&j everyday, so any ideas? :)
Update: And the most disposable the better...containers i need to take back home are not ideal. Thanks in advance for the help :)
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