Great idea, I trip over tent lines at night all the time!There are GITD Fishing Lines!
They are called "LOOM" and are produced by a company named "WFT".
I bought a few hundred meters a while ago and am using these as Tent-Lines so i wont fall over them at night.
I bought the 51kg version with 0,32mm diameter. Quite usable as 30m EDC line in my wallet too.
Fobs by Andy