I keep about 30 feet of Amsteel (Dyneema Cord) I had left from rigging a tarp for bear bagging. You can get it on Amazon, example below. It's crazy strong for the weight/diameter and abrasion resistant and I also noticed it takes less bark off the tree limb. I use the 1/16in so I can use it to replace broken shoe laces if I need to. https://www.amazon.com/dp/B003X499OI/ref=cm_sw_r_apan_i_3Z69XVM7C38YG2ESR3QW