20-35L sea to summit dry bags. Use a 2 carabiner pulley system at base camp. Toss heavy carabiner with para cord over tree limb. Pass cord through carabiner.  Pass second line with carabiner through 1st carabiner.  Pull up first line and tie off. Tie loop in 2nd cord to prevent slip through when not in use. Makes it easier to hang heavy food bags. I started this rig 7-8 years ago after the single cord I was using froze to the tree and my food got stuck until it thawed. A little extra weight but convenient for a backcountry spike camp.