Bailing wire, used to tie bails of hay and the like used to be the wonder tie where I live.
It is a soft steel wire that comes in coils. I even found it at my local Home Depot a couple of months ago so I know it is still available.
The user does have to have a pair of pliers to twist it so it's not nearly as easy as using a zip tie.
On the other hand, it is flame proof and it doesn't fall apart after it sits in the sunlight like the modern zip ties do.