Buy from Amazon.co.uk : http://www.amazon.co.uk/gp/product/B009VY6DBQ?tag=jardineriap05-21

EXPED SLIT LINE CORD (HAMMOCK SUSPENSION KIT)

Ideal Also As Laundry Line Boat Line Or Guy Line
Ideal For Hammock Setup As No Knots That Tighten Shut Under Tension Are Required
Just Feed One End Through One Or More Slits And Secure The End With A Figure Eight Not
These Slit Cords Are Easy To Use And Do Not Require Complicated Knot For Tie Off
Versatile Cords For Multiple Uses