Off-Width Crack

What would I do without my pack?
It is surgically attached to my back
Pouches and buckles it did not lack
I think I will name it Companion Jack

I always hike with Jack on my back
But as I leave stores I get some flack
It's not as if their computers I hack
Society sometimes won't cut you slack

To pay the bills I had to sell my rack
I lost what I had betting on the track
I was so distraught that I took some crack
That is how I ended up in the sack with Jack