Garden string, you get it in 100m tins from euro stores.
I think the stuff I have is sisal.
A three strand braid can be done while watching TV.
And it makes pretty decent cord.
Euro/pound/buck stores are Aladdin's caves full of cheap tat and many wonders
Plus I bought the really good paracord from eBay for £7 100m, as opposed to £13 on Amazon.
The other stuff I use is 2mm masons line.
Cheap And great for lightweight slings.