Pack In Meaning

(Can we verify(+) this sense?) (American football) This term needs a definition. Please help out and add a definition, then remove the text {{rfdef}}.

Example:   January 1989, American Motorcyclist‎
  I rode 700 miles one day before packing it in for the night, yet after 15 minutes of rest in my hotel room, I realized that I could have gone farther.
  6 Febraury 2009, Yahoo! News - At Dem retreat, a partisan love fest
  As the Senate deliberated in Washington – and packed it in for the night without finalizing a deal — Obama brushed pressed House Democrats to finalize
  7 November 2009, The Sun - Captain Crunch compares 'greener' light bulbs
  LAST year I was diagnosed with cervical cancer and had to pack in my job as a full-time cleaner as I needed chemo and radiotherapy
  13 June 1997, Los Angeles Times - MOVIE REVIEW Speed 2: Cruise Control
  Though co-star Keanu Reeves considered this new trip unnecessary, the "Speed 2" crew has packed in lots of references from the original.
To transport to base camp, especially by backpack.