BLAST.. i take aged cheddar..the older the better..jarlsberg
  also keeps well..i take both on canoe trips in a small soft
  side cooler along with jam tubes and margarine..
  i also see some high end meat sticks in the dele case at
   the supermarket..some covered in herbs and course pepper..
   last trip i took one that had the least coatings and it
   kept well and i had it for lunch..sorry i don't recall the 
   name...i have also used string cheese in one serving packs.   
 
      the photo is a typical lunch..the summer sausage was made
     from buffalo and did not keep very well.i had to trim
     the end if i did not cut off a hunk for lunch every day
     so i went to the high end stuff at twice the price but
      it did keep better,only weaping a bit of grease on the
      cut end between uses
    BLAST-- just went thru my canoe logs..it's Colmbus brand..
    the dry one without the pepper and herbs..
    also found in my notes i was using Hoffmans Smoked Cheddar.