I keep 100' of BlueWater 4mm accessory cord in the car. When I'm hiking or backpacking I usually carry, at least, a couple of pieces of AirCore. It's good for lowering packs and other misc tasks.

I should probably pick up some 550 just so I don't get kicked out of the club.
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"There is not a man of us who does not at times need a helping hand to be stretched out to him, and then shame upon him who will not stretch out the helping hand to his brother." -Theodore Roosevelt