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A Jack Pack is like a prison hot dog wrapped in plastic that you can suck on and stick to the shower wall while you jerk off. You can keep it for yourself or trade it for snacks and candy.
Yo, I got a Jack Pack. I’m gonna stick it to the shower and let the whole cell block watch me jerk off.
I paid 10 Snickers bars for a Jack Pack. It was worth it.
That Jack Pack got me through three showers and a full commissary run.