The title is nothing more then a Joke so please do get excited. I’m not saying use this in heavy bear country.
That said if your looking for a strong **FREE** fabric hit the local pick and pull and get a few air bags. Most of the yards around me will not charge for them if your already getting something. They have no value once opened. If you can find a side air bag they are the biggest but the passenger side are OK. So far I’ve been using ones from Honda as they have a plastic coating on the inside I think works well. The material varies from company to company but most use some strong blend of nylon, Spectra and Vectran. Similar to what Ursack uses for there bags.
Due to the shape of airbags it’s a bit tricky to cut apart and get usable shapes but depending how big you could possible just use a driver side and just roll the edge.
I’ve attached one I’ve made along with a few other pictures. The first is the uncut airbag, the second is a close up of the fabric. The last two are of the bag I made.