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2.
A backpack/bag/duffel/etc. which contains emergency clothing and hygenics, in the event one cannot go home before going to work/school/see the GF/parents etc. after unexpectedly being up all night partying/doing drugs/banging the mistress/etc.
Matt: Yo man, you gotta work in an hour and we been here blowing llello all night. Won't yo ho know you been up all night when yo go home to change?

Pat: Na, I got it all here in my crack pack.
by djkevinz February 16, 2008
 
1.
A gay false imitation of abdominal muscles, usually caused by malnutrition or heavy drug use. Predominantly seen in crack addicts and trailer trash.
'That guy is so reem with his six pack'
'Bitch please, that's a crack pack.'
by PuuPuuPlater December 07, 2013