plastic garbage bags take up little room, can be used for trash after camp setup, using new ones in the morn. Small inflatable mattress or pool floating mattress keeps you better rested. Take a length of cord or light rope, lower dead tree branches pulled down make great firewood if it's been raining, use for line to dry bedding and clothes + more. A good sheath knife. Soft sided cooler, use to store cooking supplies, ice and drink/food after camp set.
I'll think some more...done this lots. Have fun!
later, Tom.
