Hey there!  Are you exited to go camping?
yes i am 
Awesome!  Would you mind sharing your highest priority items with me so we can come up with a fair deal?
Im in need of Firewood
Okay, I am in need of firewood too since it will be so cold tonight unfortunately.  But I would be willing to only accept 1 firewood if I can have 2 of water and 2 of food
sorry i cant do that
Why not?  That way you would get 4 packages in total and 2 of your most valuable ones.  I would get 5 packages in total but only 1 of my most valuable ones?
Okay could you exchange me Food as well?
How about I get 1 firewood, 2 water, 2 food.  You get 2 firewood, 1 water, 1 food?
okay thats a deal